fix sign-compare warning.

content/common/gpu/media/video_encode_accelerator_unittest.cc

 // Copyright 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.
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/memory_mapped_file.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 576 matching lines @@
   // we'll be treating ourselves to random corruption.
   // Since we are just mmapping and passing chunks of the input file, to ensure
   // alignment, if the starting virtual addresses of the frames in it were not
   // 64 byte-aligned, we'd have to use a separate set of input buffers and copy
   // the frames into them before sending to the encoder. It would have been an
   // overkill here though, because, for now at least, we only test resolutions
   // that result in proper alignment, and it would have also interfered with
   // 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, 0)
+  ASSERT_EQ(input_buffer_size_ & 63, 0u)
       << "Frame size has to be a multiple of 64 bytes";
   ASSERT_EQ(reinterpret_cast<off_t>(test_stream_.input_file.data()) & 63, 0)
       << "Mapped file should be mapped at a 64 byte boundary";
 
   num_required_input_buffers_ = input_count;
   ASSERT_GT(num_required_input_buffers_, 0UL);
 
   num_frames_in_stream_ = test_stream_.input_file.length() / input_buffer_size_;
   CHECK_GT(num_frames_in_stream_, 0UL);
   CHECK_LE(num_frames_in_stream_, kMaxFrameNum);
@@ skipping 396 matching lines @@
       test_stream_data->assign(it->second.c_str());
       continue;
     }
     if (it->first == "v" || it->first == "vmodule")
       continue;
     LOG(FATAL) << "Unexpected switch: " << it->first << ":" << it->second;
   }
 
   return RUN_ALL_TESTS();
 }