Make the generated stubs weak. Enable the unittests that had conflicting symbols.

media/filters/video_decoder_unittest.cc

 // Copyright (c) 2009 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.
 
 #include <string>
 
 #include "media/base/factory.h"
 #include "media/base/filter_host.h"
 #include "media/base/filters.h"
 #include "media/base/media_format.h"
 #include "media/base/mock_media_filters.h"
 #include "media/base/pipeline_impl.h"
 #include "media/filters/test_video_decoder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using media::FilterFactoryCollection;
 using media::InstanceFilterFactory;
-using media::MockAudioDecoder;
-using media::MockAudioRenderer;
-using media::MockDataSource;
-using media::MockDemuxer;
-using media::MockFilterConfig;
-using media::MockFilterFactory;
-using media::MockVideoRenderer;
 using media::PipelineImpl;
 using media::TestVideoDecoder;
-using media::VideoFrame;
+using media::old_mocks::InitializationHelper;
+using media::old_mocks::MockFilterConfig;
+using media::old_mocks::MockFilterFactory;
 
 TEST(VideoDecoder, CreateTestDecoder) {
   std::string url("");
   PipelineImpl p;
   scoped_refptr<TestVideoDecoder> test_decoder = new TestVideoDecoder();
   MockFilterConfig config;
   scoped_refptr<FilterFactoryCollection> c = new FilterFactoryCollection();
   c->AddFactory(new InstanceFilterFactory<TestVideoDecoder>(test_decoder));
   c->AddFactory(new MockFilterFactory(&config));
-  media::InitializationHelper h;
+  InitializationHelper h;
   h.Start(&p, c, url);
   p.SetPlaybackRate(1.0f);
   p.Stop();
 }