Revert "Run install-build-deps in the middle of 'fetch chromium'"

This reverts commit 78624b6839.

The reason is that install-build-deps.sh isn't meant to be run on mac
or windows, and this implementation ran it everywhere.

TBR=dpranke@chromium.org
BUG=229270

Review URL: https://codereview.chromium.org/1186893003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295686 0039d316-1c4b-4281-b951-d872f2087c98

fetch.py

@@ -62,7 +62,7 @@ class Checkout(object):
   def run(self, cmd, **kwargs):
     print 'Running: %s' % (' '.join(pipes.quote(x) for x in cmd))
     if self.options.dry_run:
-      return ''
+      return 0
     return subprocess.check_output(cmd, **kwargs)
 
 
@@ -133,7 +133,7 @@ class GclientGitCheckout(GclientCheckout, GitCheckout):
     # Configure and do the gclient checkout.
     self.run_gclient('config', '--spec', self._format_spec())
     sync_cmd = ['sync']
-    if self.options.nohooks or self.spec.get('fetch_hooks'):
+    if self.options.nohooks:
       sync_cmd.append('--nohooks')
     if self.options.no_history:
       sync_cmd.append('--no-history')
@@ -141,11 +141,6 @@ class GclientGitCheckout(GclientCheckout, GitCheckout):
       sync_cmd.append('--with_branch_heads')
     self.run_gclient(*sync_cmd)
 
-    for cmd in self.spec.get('fetch_hooks', []):
-      self.run(cmd)
-    if self.spec.get('fetch_hooks') and not self.options.nohooks:
-      self.run_gclient('runhooks')
-
     # Configure git.
     wd = os.path.join(self.base, self.root)
     if self.options.dry_run: