Rejigger ThemeService: move exposure of ThemeProvider interface to a

chrome/browser/ui/cocoa/gradient_button_cell.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.
 
 #include "chrome/browser/ui/cocoa/gradient_button_cell.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
@@ skipping 586 matching lines @@
   const CGFloat lineWidth = [controlView cr_lineWidth];
 
   if (shouldTheme_) {
     BOOL isTemplate = [[self image] isTemplate];
 
     gfx::ScopedNSGraphicsContextSaveGState scopedGState;
 
     CGContextRef context =
         (CGContextRef)([[NSGraphicsContext currentContext] graphicsPort]);
 
-    ThemeService* themeProvider = static_cast<ThemeService*>(
-        [[controlView window] themeProvider]);
+    ui::ThemeProvider* themeProvider = [[controlView window] themeProvider];

[groby-ooo-7-16, 2015/12/11 02:32:01]

THANK YOU!

     NSColor* color = themeProvider ?
         themeProvider->GetNSColorTint(ThemeProperties::TINT_BUTTONS) :
         [NSColor blackColor];
 
-    if (isTemplate && themeProvider && themeProvider->UsingDefaultTheme()) {
+    if (isTemplate && themeProvider && themeProvider->UsingSystemTheme()) {
       base::scoped_nsobject<NSShadow> shadow([[NSShadow alloc] init]);
       [shadow.get() setShadowColor:themeProvider->GetNSColor(
           ThemeProperties::COLOR_TOOLBAR_BEZEL)];
       [shadow.get() setShadowOffset:NSMakeSize(0.0, -lineWidth)];
       [shadow setShadowBlurRadius:lineWidth];
       [shadow set];
     }
 
     CGContextBeginTransparencyLayer(context, 0);
     NSRect imageRect = NSZeroRect;
@@ skipping 163 matching lines @@
                              options:options
                                owner:self
                             userInfo:nil]);
   if (isMouseInside_ != mouseInView) {
     [self setMouseInside:mouseInView animate:NO];
     [controlView setNeedsDisplay:YES];
   }
 }
 
 @end