fix sign-compare warning.

content/common/gpu/media/video_encode_accelerator_unittest.cc

Index: content/common/gpu/media/video_encode_accelerator_unittest.cc
diff --git a/content/common/gpu/media/video_encode_accelerator_unittest.cc b/content/common/gpu/media/video_encode_accelerator_unittest.cc
index b50e902bc5744d635e233ee7b445f166883e9e5b..4552fd4bc541861637fba529198c9e6ea389b6bc 100644
--- a/content/common/gpu/media/video_encode_accelerator_unittest.cc
+++ b/content/common/gpu/media/video_encode_accelerator_unittest.cc
@@ -533,7 +533,7 @@ VEAClient::VEAClient(const TestStream& test_stream,
 
   // Calculate the number of frames in the input stream by dividing its length
   // in bytes by frame size in bytes.
-  CHECK_EQ(test_stream_.input_file.length() % input_buffer_size_, 0)
+  CHECK_EQ(test_stream_.input_file.length() % input_buffer_size_, 0UL)
       << "Stream byte size is not a product of calculated frame byte size";
   num_frames_in_stream_ = test_stream_.input_file.length() / input_buffer_size_;
   CHECK_GT(num_frames_in_stream_, 0UL);
@@ -622,9 +622,10 @@ void VEAClient::RequireBitstreamBuffers(unsigned int input_count,
   // performance testing. So just assert that the frame size is a multiple of
   // 64 bytes. This ensures all frames start at 64-byte boundary, because
   // MemoryMappedFile should be mmapp()ed at virtual page start as well.
-  ASSERT_EQ(input_buffer_size_ & 63, 0u)
+  ASSERT_EQ(input_buffer_size_ & 63, static_cast<size_t>(0))

[xhwang, 2014/06/05 00:26:28]

Will 0u work?

       << "Frame size has to be a multiple of 64 bytes";
-  ASSERT_EQ(reinterpret_cast<off_t>(test_stream_.input_file.data()) & 63, 0)
+  ASSERT_EQ(reinterpret_cast<off_t>(test_stream_.input_file.data()) & 63,
+            static_cast<size_t>(0))

[xhwang, 2014/06/05 00:26:28]

ditto

       << "Mapped file should be mapped at a 64 byte boundary";
 #endif