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

media/filters/video_renderer_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 "media/base/factory.h"
 #include "media/base/filters.h"
 #include "media/base/mock_media_filters.h"
 #include "media/base/mock_filter_host.h"
 #include "media/filters/test_video_renderer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using media::FilterFactory;
-using media::MockFilterConfig;
 using media::MockFilterHost;
 using media::MockPipeline;
-using media::MockVideoDecoder;
 using media::TestVideoRenderer;
+using media::old_mocks::MockFilterConfig;
+using media::old_mocks::MockVideoDecoder;
 
 TEST(VideoRenderer, CreateAndPlay) {
   // Prepare test data.
   MockFilterConfig config;
   scoped_refptr<MockVideoDecoder> decoder = new MockVideoDecoder(&config);
   scoped_refptr<TestVideoRenderer> renderer = new TestVideoRenderer();
 
   // Setup our mock pipeline.
   MockPipeline pipeline;
   MockFilterHost<MockVideoDecoder> filter_host_a(&pipeline, decoder);
@@ skipping 20 matching lines @@
     pipeline.SetTime(previous_time);
     filter_host_b.GetTimeUpdateCallback()->Run(previous_time);
     pipeline.RunAllTasks();
 
     // Renderer should have scheduled a new callback time and painted a frame.
     EXPECT_GT(filter_host_b.GetScheduledCallbackTime().InMicroseconds(),
               previous_time.InMicroseconds());
     EXPECT_EQ(previous_unique_frames + 1, renderer->unique_frames());
   }
 }