Delete some unused code found by -Wunused-function

ui/base/layout.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 "ui/base/layout.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
@@ skipping 12 matching lines @@
 #include "base/mac/mac_util.h"
 #endif
 
 #if defined(OS_WIN)
 #include "base/win/metro.h"
 #include <Windows.h>
 #endif  // defined(OS_WIN)
 
 namespace {
 
+#if defined(OS_WIN) || defined(USE_ASH)
 // Helper function that determines whether we want to optimize the UI for touch.
 bool UseTouchOptimizedUI() {
   // If --touch-optimized-ui is specified and not set to "auto", then override
   // the hardware-determined setting (eg. for testing purposes).
   static bool has_touch_optimized_ui = CommandLine::ForCurrentProcess()->
       HasSwitch(switches::kTouchOptimizedUI);
   if (has_touch_optimized_ui) {
     const std::string switch_value = CommandLine::ForCurrentProcess()->
         GetSwitchValueASCII(switches::kTouchOptimizedUI);
 
     // Note that simply specifying the switch is the same as enabled.
     if (switch_value.empty() ||
         switch_value == switches::kTouchOptimizedUIEnabled) {
       return true;
     } else if (switch_value == switches::kTouchOptimizedUIDisabled) {
       return false;
     } else if (switch_value != switches::kTouchOptimizedUIAuto) {
       LOG(ERROR) << "Invalid --touch-optimized-ui option: " << switch_value;
     }
   }
 
 #if defined(OS_WIN)
   // On Windows, we use the touch layout only when we are running in
   // Metro mode.
   return base::win::IsMetroProcess() && base::win::IsTouchEnabled();
 #else
   return false;
 #endif
 }
+#endif  // defined(OS_WIN) || defined(USE_ASH)
 
 const float kScaleFactorScales[] = {1.0f, 1.4f, 1.8f, 2.0f};
 COMPILE_ASSERT(ui::NUM_SCALE_FACTORS == arraysize(kScaleFactorScales),
                kScaleFactorScales_incorrect_size);
 const size_t kScaleFactorScalesLength = arraysize(kScaleFactorScales);
 
 std::vector<ui::ScaleFactor>& GetSupportedScaleFactorsInternal() {
   static std::vector<ui::ScaleFactor>* supported_scale_factors =
       new std::vector<ui::ScaleFactor>();
   if (supported_scale_factors->empty()) {
@@ skipping 88 matching lines @@
   return GetScaleFactorFromScale(
       root_window->compositor()->device_scale_factor());
 #else
   NOTIMPLEMENTED();
   return SCALE_FACTOR_NONE;
 #endif
 }
 #endif  // !defined(OS_MACOSX)
 
 }  // namespace ui