[Coverity] Pass-by-val -> pass-by-ref

CID=101489,101490,101491,101492
CID_COUNT=4

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9873008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@129654 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 5 deletions

diff --git a/media/video/capture/win/video_capture_device_win.cc b/media/video/capture/win/video_capture_device_win.cc
index e4f9a6d..d073d21 100644
--- a/media/video/capture/win/video_capture_device_win.cc
+++ b/media/video/capture/win/video_capture_device_win.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -151,19 +151,20 @@ struct ResolutionDiff {
   media::VideoCaptureDevice::Format color;
 };
 
-bool CompareHeight(ResolutionDiff item1, ResolutionDiff item2) {
+bool CompareHeight(const ResolutionDiff& item1, const ResolutionDiff& item2) {
   return abs(item1.diff_height) < abs(item2.diff_height);
 }
 
-bool CompareWidth(ResolutionDiff item1, ResolutionDiff item2) {
+bool CompareWidth(const ResolutionDiff& item1, const ResolutionDiff& item2) {
   return abs(item1.diff_width) < abs(item2.diff_width);
 }
 
-bool CompareFrameRate(ResolutionDiff item1, ResolutionDiff item2) {
+bool CompareFrameRate(const ResolutionDiff& item1,
+                      const ResolutionDiff& item2) {
   return abs(item1.diff_frame_rate) < abs(item2.diff_frame_rate);
 }
 
-bool CompareColor(ResolutionDiff item1, ResolutionDiff item2) {
+bool CompareColor(const ResolutionDiff& item1, const ResolutionDiff& item2) {
   return (item1.color < item2.color);
 }