Mac: Make more views adopts ThemedWindowDrawing

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

 // Copyright 2014 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_strip_background_view.h"
 
 #import "chrome/browser/ui/cocoa/framed_browser_window.h"
 #import "ui/base/cocoa/nsview_additions.h"
 
 @implementation TabStripBackgroundView
@@ skipping 22 matching lines @@
     NSRect strokeRect = NSInsetRect(roundedRect, -lineWidth/2, lineWidth/2);
     NSBezierPath* path = [NSBezierPath bezierPathWithRoundedRect:strokeRect
                                                          xRadius:cornerRadius
                                                          yRadius:cornerRadius];
     [path setLineWidth:lineWidth];
     [[NSColor colorWithCalibratedWhite:1.0 alpha:0.5] set];
     [path stroke];
   }
 }
 
-- (void)viewWillMoveToWindow:(NSWindow*)window {
-  if ([self window]) {
-    [[NSNotificationCenter defaultCenter]
-        removeObserver:self
-                  name:NSWindowDidBecomeMainNotification
-                object:[self window]];
-    [[NSNotificationCenter defaultCenter]
-        removeObserver:self
-                  name:NSWindowDidResignMainNotification
-                object:[self window]];
-  }
-  if (window) {
-    [[NSNotificationCenter defaultCenter]
-        addObserver:self
-           selector:@selector(windowFocusDidChange:)
-               name:NSWindowDidBecomeMainNotification
-             object:window];
-    [[NSNotificationCenter defaultCenter]
-        addObserver:self
-           selector:@selector(windowFocusDidChange:)
-               name:NSWindowDidResignMainNotification
-             object:window];
-  }
-}
+// ThemedWindowDrawing implementation.
 
-- (void)windowFocusDidChange:(NSNotification*)notification {
-  // The theme image may depend on the window's active state.
+- (void)windowDidChangeTheme {
   [self setNeedsDisplay:YES];
 }
 
+- (void)windowDidChangeActive {
+  [self setNeedsDisplay:YES];
+}
+
 @end