mac: Prepare for -Wunused-functions.

cc/layers/picture_layer_impl.cc

 // Copyright 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 "cc/layers/picture_layer_impl.h"
 
 #include <algorithm>
 
 #include "base/time/time.h"
 #include "cc/base/math_util.h"
@@ skipping 770 matching lines @@
 }
 
 namespace {
 
 inline float PositiveRatio(float float1, float float2) {
   DCHECK_GT(float1, 0);
   DCHECK_GT(float2, 0);
   return float1 > float2 ? float1 / float2 : float2 / float1;
 }
 
-inline bool IsCloserToThan(
-    PictureLayerTiling* layer1,
-    PictureLayerTiling* layer2,
-    float contents_scale) {
-  // Absolute value for ratios.
-  float ratio1 = PositiveRatio(layer1->contents_scale(), contents_scale);
-  float ratio2 = PositiveRatio(layer2->contents_scale(), contents_scale);
-  return ratio1 < ratio2;
-}
-
 }  // namespace
 
 void PictureLayerImpl::ManageTilings(bool animating_transform_to_screen) {
   DCHECK(ideal_contents_scale_);
   DCHECK(ideal_page_scale_);
   DCHECK(ideal_device_scale_);
   DCHECK(ideal_source_scale_);
   DCHECK(CanHaveTilings());
   DCHECK(!needs_post_commit_initialization_);
 
@@ skipping 283 matching lines @@
   state->Set("coverage_tiles", coverage_tiles.release());
   state->SetBoolean("is_using_lcd_text", is_using_lcd_text_);
 }
 
 size_t PictureLayerImpl::GPUMemoryUsageInBytes() const {
   const_cast<PictureLayerImpl*>(this)->DoPostCommitInitializationIfNeeded();
   return tilings_->GPUMemoryUsageInBytes();
 }
 
 }  // namespace cc