Change Read size to a size_t for clarity

media/filters/ffmpeg_demuxer_unittest.cc

 // 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.
 
 #include <deque>
 
 #include "base/file_path.h"
 #include "base/path_service.h"
 #include "base/threading/thread.h"
 #include "media/base/filters.h"
@@ skipping 479 matching lines @@
   EXPECT_CALL(*demuxer, SignalReadCompleted(512));
   EXPECT_CALL(*demuxer, WaitForRead())
       .WillOnce(Return(512));
   EXPECT_CALL(host_, SetCurrentReadPosition(1024));
 
   // Third read will fail because it exceeds the file size.
   EXPECT_CALL(*data_source, GetSize(_))
       .WillOnce(DoAll(SetArgPointee<0>(1024), Return(true)));
 
   // First read.
-  EXPECT_EQ(512, demuxer->Read(512, kBuffer));
+  EXPECT_EQ(512u, demuxer->Read(512, kBuffer));
   int64 position;
   EXPECT_TRUE(demuxer->GetPosition(&position));
   EXPECT_EQ(512, position);
 
   // Second read.
-  EXPECT_EQ(512, demuxer->Read(512, kBuffer));
+  EXPECT_EQ(512u, demuxer->Read(512, kBuffer));
   EXPECT_TRUE(demuxer->GetPosition(&position));
   EXPECT_EQ(1024, position);
 
   // Third read will get an end-of-file error, which is represented as zero.
-  EXPECT_EQ(0, demuxer->Read(512, kBuffer));
+  EXPECT_EQ(0u, demuxer->Read(512, kBuffer));
 
   // This read complete signal is generated when demuxer is stopped.
   EXPECT_CALL(*demuxer, SignalReadCompleted(DataSource::kReadError));
   demuxer->Stop(NewExpectedCallback());
   message_loop_.RunAllPending();
 }
 
 TEST_F(FFmpegDemuxerTest, GetBitrate_SetInContainer) {
   EXPECT_TRUE(VideoHasValidBitrate("bear.ogv", false));
 }
@@ skipping 44 matching lines @@
 
 TEST_F(FFmpegDemuxerTest, ProtocolIsStreaming) {
   scoped_refptr<DataSource> data_source = CreateDataSource("bear-320x240.webm");
   InitializeDemuxer(data_source);
 
   EXPECT_FALSE(data_source->IsStreaming());
   EXPECT_FALSE(demuxer_->IsStreaming());
 }
 
 }  // namespace media