cc: Remove unused kOnDemandRasterTaskPriority.

cc/resources/raster_worker_pool.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 "cc/resources/raster_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
@@ skipping 70 matching lines @@
 
  private:
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   const base::Closure on_raster_finished_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(RasterFinishedTaskImpl);
 };
 
 }  // namespace
 
-// This allows an external rasterize on-demand system to run raster tasks
-// with highest priority using the same task graph runner instance.
-unsigned RasterWorkerPool::kOnDemandRasterTaskPriority = 0u;
 // This allows a micro benchmark system to run tasks with highest priority,
 // since it should finish as quickly as possible.
 unsigned RasterWorkerPool::kBenchmarkRasterTaskPriority = 0u;
 // Task priorities that make sure raster finished tasks run before any
 // remaining raster tasks.
 unsigned RasterWorkerPool::kRasterFinishedTaskPriority = 1u;
 unsigned RasterWorkerPool::kRasterTaskPriorityBase = 2u;
 
 RasterWorkerPool::RasterWorkerPool() {}
 
@@ skipping 134 matching lines @@
     // is fixed.
     const size_t dst_row_bytes = SkAlign4(dst_info.minRowBytes());
     DCHECK_EQ(0u, dst_row_bytes % 4);
     bool success = bitmap->readPixels(dst_info, buffer, dst_row_bytes, 0, 0);
     DCHECK_EQ(true, success);
   }
   bitmap->reset();
 }
 
 }  // namespace cc