Break FileIO and URLLoader tests down into individual cases.

chrome/chrome_tests.gypi

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 702 matching lines @@
         }],  # OS != "win"
       ],  # conditions
     },
     {
       'target_name': 'ui_tests',
       'type': 'executable',
       'copies': [
         {
           'destination': '<(PRODUCT_DIR)',
           'files': [
+            # Keep 'test_case.html.mock-http-headers' with 'test_case.html'.
             '../ppapi/tests/test_case.html',
             '../ppapi/tests/test_case.html.mock-http-headers',
             '../ppapi/tests/test_page.css',
             '../ppapi/native_client/tests/ppapi_tests/test_case.nmf',
           ],
         },
         {
           'destination': '<(PRODUCT_DIR)/test_url_loader_data',
           'files': [
             '../ppapi/tests/test_url_loader_data/hello.txt',
@@ skipping 3581 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }