[Cocoa] Tab audio mute control, behind a switch (off by default).

chrome/browser/ui/cocoa/tabs/tab_controller.h

Index: chrome/browser/ui/cocoa/tabs/tab_controller.h
diff --git a/chrome/browser/ui/cocoa/tabs/tab_controller.h b/chrome/browser/ui/cocoa/tabs/tab_controller.h
index 4260b342a567ca33ef7f69ae26fe5e671405fdac..be15323cb138fa77c22658f2b4fcc57d442e3aec 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_controller.h
+++ b/chrome/browser/ui/cocoa/tabs/tab_controller.h
@@ -20,7 +20,7 @@ enum TabLoadingState {
   kTabCrashed,
 };
 
-@class MediaIndicatorView;
+@class MediaIndicatorButton;
 @class MenuController;
 namespace TabControllerInternal {
 class MenuDelegate;
@@ -43,7 +43,7 @@ class MenuDelegate;
 @interface TabController : NSViewController<TabDraggingEventTarget> {
  @private
   base::scoped_nsobject<SpriteView> iconView_;
-  base::scoped_nsobject<MediaIndicatorView> mediaIndicatorView_;
+  base::scoped_nsobject<MediaIndicatorButton> mediaIndicatorButton_;
   base::scoped_nsobject<HoverCloseButton> closeButton_;
 
   NSRect originalIconFrame_;  // frame of iconView_ as loaded from nib
@@ -78,7 +78,7 @@ class MenuDelegate;
 @property(assign, nonatomic) id target;
 @property(assign, nonatomic) GURL url;
 @property(readonly, nonatomic) NSView* iconView;
-@property(assign, nonatomic) MediaIndicatorView* mediaIndicatorView;
+@property(readonly, nonatomic) MediaIndicatorButton* mediaIndicatorButton;
 @property(readonly, nonatomic) HoverCloseButton* closeButton;
 
 // Minimum and maximum allowable tab width. The minimum width does not show