Re-add (curiously) missing 'return' statement to differ_unittest.

remoting/host/differ_unittest.cc

 // Copyright (c) 2010 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/scoped_ptr.h"
 #include "remoting/host/differ.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace remoting {
 
@@ skipping 32 matching lines @@
   void ClearBuffer(uint8* buffer) {
     memset(buffer, 0, buffer_size_);
   }
 
   // Convenience wrapper for Differ's DiffBlock that calculates the appropriate
   // offset to the start of the desired block.
   DiffInfo DiffBlock(int block_x, int block_y) {
     // Offset from upper-left of buffer to upper-left of requested block.
     int block_offset = ((block_y * stride_) + (block_x * bytes_per_pixel_))
                         * kBlockSize;
-    differ_->DiffBlock(prev_.get() + block_offset,
+    return differ_->DiffBlock(prev_.get() + block_offset,
                               curr_.get() + block_offset,
                               stride_);
   }
 
   // Write the pixel |value| into the specified block in the |buffer|.
   // This is a convenience wrapper around WritePixel().
   void WriteBlockPixel(uint8* buffer, int block_x, int block_y,
                        int pixel_x, int pixel_y, uint32 value) {
     WritePixel(buffer, (block_x * kBlockSize) + pixel_x,
                (block_y * kBlockSize) + pixel_y, value);
@@ skipping 457 matching lines @@
 
   dirty = new DirtyRects();
   differ_->MergeBlocks(dirty);
 
   ASSERT_EQ(2, dirty->size());
   CheckDirtyRect(dirty->at(0), 0, 0, 2, 2);
   CheckDirtyRect(dirty->at(1), 1, 2, 1, 1);
 }
 
 }  // namespace remoting