Fix typos in PDFium fetch config.

- The extra comma at the end of the url string unintentionally turns
  the url into a list.
- The project name should be "pdfium".

Change-Id: I8944d59d06751716c512030145d29aac10cf13fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3770290
Reviewed-by: Aravind Vasudevan <aravindvasudev@google.com>
Commit-Queue: Lei Zhang <thestig@chromium.org>

fetch_configs/pdfium.py

@@ -14,9 +14,9 @@ class PdfiumConfig(config_util.Config):
 
   @staticmethod
   def fetch_spec(props):
-    url = 'https://pdfium.googlesource.com/pdfium.git',
+    url = 'https://pdfium.googlesource.com/pdfium.git'
     solution = {
-        'name': 'src',
+        'name': 'pdfium',
         'url': url,
         'managed': False,
         'custom_vars': {},