Rejigger ThemeService: move exposure of ThemeProvider interface to a

chrome/browser/ui/cocoa/tabs/tab_view.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 259 matching lines @@
     // If the mouse up occurred in our view or over the close button, then
     // close.
     if ([self hitTest:upLocation])
       [controller_ closeTab:self];
   }
 }
 
 // Returns the color used to draw the background of a tab. |selected| selects
 // between the foreground and background tabs.
 - (NSColor*)backgroundColorForSelected:(bool)selected {
-  ThemeService* themeProvider =
-      static_cast<ThemeService*>([[self window] themeProvider]);
+  ui::ThemeProvider* themeProvider = [[self window] themeProvider];
   if (!themeProvider)
     return [[self window] backgroundColor];
 
   int bitmapResources[2][2] = {
     // Background window.
     {
       IDR_THEME_TAB_BACKGROUND_INACTIVE,  // Background tab.
       IDR_THEME_TOOLBAR_INACTIVE,         // Active tab.
     },
     // Currently focused window.
     {
       IDR_THEME_TAB_BACKGROUND,  // Background tab.
       IDR_THEME_TOOLBAR,         // Active tab.
     },
   };
 
   // Themes don't have an inactive image so only look for one if there's no
   // theme.
   bool active =
-      [[self window] isMainWindow] || !themeProvider->UsingDefaultTheme();
+      [[self window] isMainWindow] || !themeProvider->UsingSystemTheme();
   return themeProvider->GetNSImageColorNamed(bitmapResources[active][selected]);
 }
 
 // Draws the tab background.
 - (void)drawFill:(NSRect)dirtyRect {
   gfx::ScopedNSGraphicsContextSaveGState scopedGState;
   NSRect bounds = [self bounds];
 
   NSRect clippingRect = bounds;
   clippingRect.size.height = kFillHeight;
@@ skipping 393 matching lines @@
   }
 
   if (nextUpdate < kNoUpdate)
     [self performSelector:_cmd withObject:nil afterDelay:nextUpdate];
 
   [self resetLastGlowUpdateTime];
   [self setNeedsDisplay:YES];
 }
 
 @end  // @implementation TabView(Private)