Add a few missing "self = [super init..." notices by the clang static analyzer.

chrome/browser/ui/panels/panel_titlebar_view_cocoa.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/panels/panel_titlebar_view_cocoa.h"
 
 #include <Carbon/Carbon.h>  // kVK_Escape
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
@@ skipping 63 matching lines @@
   [super mouseDown:event];
 }
 
 - (BOOL)acceptsFirstMouse:(NSEvent*)event {
   return YES;
 }
 @end
 
 @implementation RepaintAnimation
 - (id)initWithView:(NSView*)targetView duration:(double) duration {
-  if (![super initWithDuration:duration animationCurve:NSAnimationEaseInOut])
-    return nil;
-  [self setAnimationBlockingMode:NSAnimationNonblocking];
-  targetView_ = targetView;
+  if ((self = [super initWithDuration:duration
+                       animationCurve:NSAnimationEaseInOut])) {
+    [self setAnimationBlockingMode:NSAnimationNonblocking];
+    targetView_ = targetView;
+  }
   return self;
 }
 
 - (void)setCurrentProgress:(NSAnimationProgress)progress {
   [super setCurrentProgress:progress];
   [targetView_ setNeedsDisplay:YES];
 }
 @end
 
 
@@ skipping 576 matching lines @@
 }
 
 - (void)checkMouseAndUpdateSettingsButtonVisibility {
   BOOL mouseOverWindow = NSPointInRect([NSEvent mouseLocation],
                                        [[self window] frame]);
   [self updateSettingsButtonVisibility:mouseOverWindow];
 }
 
 @end