Normalize _unittest.cc filename suffix for unittests

ui/v2/v2.gyp

 # Copyright (c) 2013 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 42 matching lines @@
       'type': 'executable',
       'dependencies': [
         '../../base/base.gyp:test_support_base',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../gfx/gfx.gyp:gfx',
         '../gfx/gfx.gyp:gfx_geometry',
         'v2',
       ],
       'sources': [
-        'src/v2_unittests.cc',
+        'src/v2_unittest.cc',
         'src/view_unittest.cc',
       ],
     },
   ],
 }