Replace animated tab audio indicator with static tab audio indicator.

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

Index: chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
index 216ff3bb101dfb8d26320f07f18cae8dfd34a9d5..1c219aff5d4cb2699ce75f6474c62b0bf9ae86f2 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.h
@@ -132,6 +132,9 @@ class AnimationContainer;
   // The default favicon, so we can use one copy for all buttons.
   base::scoped_nsobject<NSImage> defaultFavicon_;
 
+  // The audio indicator image, so we can use one copy for all tabs.
+  base::scoped_nsobject<NSImage> audioIndicatorImage_;
+
   // The amount by which to indent the tabs on the sides (to make room for the
   // red/yellow/green and incognito/fullscreen buttons).
   CGFloat leftIndentForControls_;