cc: Fix const value pattern by replacing it by non-const or reference.

cc/tiles/software_image_decode_cache.cc

 // Copyright 2015 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 "cc/tiles/software_image_decode_cache.h"
 
 #include <inttypes.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 79 matching lines @@
   SoftwareImageDecodeCache* cache_;
   const DrawImage& draw_image_;
   const DecodedDrawImage& decoded_draw_image_;
 };
 
 class ImageDecodeTaskImpl : public TileTask {
  public:
   ImageDecodeTaskImpl(SoftwareImageDecodeCache* cache,
                       const SoftwareImageDecodeCache::ImageKey& image_key,
                       const DrawImage& image,
-                      const SoftwareImageDecodeCache::DecodeTaskType task_type,
+                      SoftwareImageDecodeCache::DecodeTaskType task_type,
                       const ImageDecodeCache::TracingInfo& tracing_info)
       : TileTask(true),
         cache_(cache),
         image_key_(image_key),
         image_(image),
         task_type_(task_type),
         tracing_info_(tracing_info) {}
 
   // Overridden from Task:
   void RunOnWorkerThread() override {
@@ skipping 1066 matching lines @@
     }
   }
 }
 
 void SoftwareImageDecodeCache::OnPurgeMemory() {
   base::AutoLock lock(lock_);
   ReduceCacheUsageUntilWithinLimit(0);
 }
 
 }  // namespace cc