SkBitmap and SkPixelRef no longer need lock/unlock

chrome/browser/thumbnails/content_analysis_unittest.cc

 // 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.
 
 #include "chrome/browser/thumbnails/content_analysis.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 36 matching lines @@
   }
 
   return total;
 }
 
 bool CompareImageFragments(const SkBitmap& bitmap_left,
                            const SkBitmap& bitmap_right,
                            const gfx::Size& comparison_area,
                            const gfx::Point& origin_left,
                            const gfx::Point& origin_right) {
-  SkAutoLockPixels left_lock(bitmap_left);
-  SkAutoLockPixels right_lock(bitmap_right);
   for (int r = 0; r < comparison_area.height(); ++r) {
     for (int c = 0; c < comparison_area.width(); ++c) {
       SkColor color_left = bitmap_left.getColor(origin_left.x() + c,
                                                 origin_left.y() + r);
       SkColor color_right = bitmap_right.getColor(origin_right.x() + c,
                                                   origin_right.y() + r);
       if (color_left != color_right)
         return false;
     }
   }
@@ skipping 611 matching lines @@
 
   int histogram[256] = {};
   color_utils::BuildLumaHistogram(result, histogram);
   int non_zero_color_count = std::count_if(
       histogram, histogram + 256, [](int value) { return value > 0; });
   EXPECT_GT(non_zero_color_count, 4);
 
 }
 
 }  // namespace thumbnailing_utils