linux and chromeos: Turn on -Wunused-const-variable.

chrome/browser/ui/views/tabs/tab_strip.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/ui/views/tabs/tab_strip.h"
 
 #if defined(OS_WIN)
 #include <windowsx.h>
 #endif
 
@@ skipping 78 matching lines @@
   return static_cast<int>(floor(x + 0.5));
 }
 
 // Max number of stacked tabs.
 static const int kMaxStackedCount = 4;
 
 // Padding between stacked tabs.
 static const int kStackedPadding = 6;
 
 // See UpdateLayoutTypeFromMouseEvent() for a description of these.
+#if !defined(USE_ASH)
 const int kMouseMoveTimeMS = 200;
 const int kMouseMoveCountBeforeConsiderReal = 3;
+#endif
 
 // Amount of time we delay before resizing after a close from a touch.
 const int kTouchResizeLayoutTimeMS = 2000;
 
 // Horizontal offset for the new tab button to bring it closer to the
 // rightmost tab.
 int newtab_button_h_offset() {
   static int value = -1;
   if (value == -1) {
     switch (ui::GetDisplayLayout()) {
@@ skipping 2602 matching lines @@
   if (!adjust_layout_)
     return false;
 
 #if !defined(OS_CHROMEOS)
   if (ui::GetDisplayLayout() != ui::LAYOUT_TOUCH)
     return false;
 #endif
 
   return true;
 }