Revert "Reland "Add support for GCS deps""

This reverts commit d94a03f21e.

Reason for revert: PLATFORM_MAPPING import issue

Original change's description:
> Reland "Add support for GCS deps"
>
> This is a reland of commit 3eedee7b55
>
> Original change's description:
> > Add support for GCS deps
> >
> > Also take out GCS calling logic from download_google_storage and
> > into call_google_storage.
> >
> > GCS deps look like:
> >    'src/third_party/node/linux': {
> >        'dep_type': 'gcs',
> >        'condition': 'checkout_linux',
> >        'bucket': 'chromium-nodejs/20.11.0',
> >        'object_name': '46795170ff5df9831955f163f6966abde581c8af',
> >        'sha256sum': '887504c37404898ca41b896f448ee6d7fc24179d8fb6a4b79d028ab7e1b7153d',
> >    },
> >
> >    'src/third_party/llvm-build/Release+Asserts': {
> >        'dep_type': 'gcs',
> >        'condition': 'checkout_linux',
> >        'bucket': 'chromium-browser-clang',
> >        'object_name': 'Linux_x64/clang-llvmorg-18-init-17730-gf670112a-2.tar.xz',
> >        'sha256sum': '1e46df9b4e63c074064d75646310cb76be2f19815997a8486987189d80f991e8',
> >    },
> >
> > Example directory for src/third_party/node/linux after gclient sync:
> > - tar_file.gz is the downloaded file from GCS.
> > - node_linux_x64/ is extracted in its path.
> > - `hash` contains the sha of GCS filename.
> > ```
> > chromium/src/ ->
> >    third_party/node/linux/ ->
> >        hash, tar_file.gz, node_linux_x64/
> > ```
> >
> > Bug: b/324418194
> > Change-Id: Ibcbbff27e211f194ddb8a08494af56570a84a12b
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5299722
> > Commit-Queue: Stephanie Kim <kimstephanie@google.com>
> > Reviewed-by: Joanna Wang <jojwang@chromium.org>
>
> Bug: b/324418194
> Change-Id: I8b960f6dd3534658a9ee0b7688e68eaa15df1444
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5334791
> Commit-Queue: Stephanie Kim <kimstephanie@google.com>
> Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
> Reviewed-by: Joanna Wang <jojwang@chromium.org>

Bug: b/324418194
Change-Id: I28bc0ba838a1135ff882cd88b77dbb2cb4b85b82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5345022
Reviewed-by: Joanna Wang <jojwang@chromium.org>
Commit-Queue: Stephanie Kim <kimstephanie@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>

testing_support/fake_repos.py

@@ -16,7 +16,6 @@ import random
 import re
 import socket
 import sys
-import tarfile
 import tempfile
 import textwrap
 import time
@@ -48,9 +47,6 @@ def read_tree(tree_root):
         for f in [join(root, f) for f in files if not f.startswith('.')]:
             filepath = f[len(tree_root) + 1:].replace(os.sep, '/')
             assert len(filepath) > 0, f
-            if tarfile.is_tarfile(join(root, f)):
-                tree[filepath] = 'tarfile'
-                continue
             with io.open(join(root, f), encoding='utf-8') as f:
                 tree[filepath] = f.read()
     return tree
@@ -214,7 +210,7 @@ class FakeReposBase(object):
 
 class FakeRepos(FakeReposBase):
     """Implements populateGit()."""
-    NB_GIT_REPOS = 23
+    NB_GIT_REPOS = 21
 
     def populateGit(self):
         # Testing:
@@ -885,63 +881,6 @@ deps = {
             },
         )
 
-        self._commit_git(
-            'repo_22', {
-                'DEPS':
-                textwrap.dedent("""\
-        vars = {}
-        deps = {
-          'src/gcs_dep': {
-            'bucket': '123bucket',
-            'object_name': 'deadbeef',
-            'dep_type': 'gcs',
-            'sha256sum': 'abcd123',
-          },
-          'src/another_gcs_dep': {
-            'bucket': '456bucket',
-            'object_name': 'Linux/llvmfile.tar.gz',
-            'dep_type': 'gcs',
-            'sha256sum': 'abcd123',
-          },
-        }"""),
-                'origin':
-                'git/repo_22@1\n'
-            })
-
-        self._commit_git(
-            'repo_23', {
-                'DEPS': """
-deps = {
-  'src/repo12': '/repo_12',
-}""",
-                'origin': 'git/repo_23@1\n',
-            })
-
-        self._commit_git(
-            'repo_23', {
-                'DEPS': """
-deps = {
-  'src/repo12': '/repo_12@refs/changes/1212',
-}""",
-                'origin': 'git/repo_23@2\n',
-            })
-
-        # src/repo12 is now a GCS dependency.
-        self._commit_git(
-            'repo_23', {
-                'DEPS': """
-deps = {
-  'src/repo12': {
-    'bucket': 'bucket123',
-    'object_name': 'path_to_file.tar.gz',
-    'dep_type': 'gcs',
-    'sha256sum': 'abcd123',
-  },
-}
-""",
-                'origin': 'git/repo_23@3\n'
-            })
-
 
 class FakeRepoSkiaDEPS(FakeReposBase):
     """Simulates the Skia DEPS transition in Chrome."""