[Mac] Fix some leaks in tab drawing code.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.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/cocoa/tabs/tab_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 148 matching lines @@
 // 1x and 2x scale factors. |drawingHandler| is called once for every scale
 // factor.  This is similar to -[NSImage imageWithSize:flipped:drawingHandler:],
 // but this function always evaluates drawingHandler eagerly, and it works on
 // 10.6 and 10.7.
 NSImage* CreateImageWithSize(NSSize size,
                              void (^drawingHandler)(NSSize)) {
   base::scoped_nsobject<NSImage> result([[NSImage alloc] initWithSize:size]);
   [NSGraphicsContext saveGraphicsState];
   for (ui::ScaleFactor scale_factor : ui::GetSupportedScaleFactors()) {
     float scale = GetScaleFactorScale(scale_factor);
-    NSBitmapImageRep *bmpImageRep = [[NSBitmapImageRep alloc]
+    NSBitmapImageRep *bmpImageRep = [[[NSBitmapImageRep alloc]
         initWithBitmapDataPlanes:NULL
                       pixelsWide:size.width * scale
                       pixelsHigh:size.height * scale
                    bitsPerSample:8
                  samplesPerPixel:4
                         hasAlpha:YES
                         isPlanar:NO
                   colorSpaceName:NSDeviceRGBColorSpace
                      bytesPerRow:0
-                    bitsPerPixel:0];
+                    bitsPerPixel:0] autorelease];

[Nico, 2013/09/16 20:54:21]

!!

     [bmpImageRep setSize:size];
     [NSGraphicsContext setCurrentContext:
         [NSGraphicsContext graphicsContextWithBitmapImageRep:bmpImageRep]];
     drawingHandler(size);
     [result addRepresentation:bmpImageRep];
   }
   [NSGraphicsContext restoreGraphicsState];
 
   return result.release();
 }
@@ skipping 2111 matching lines @@
 NSView* GetSheetParentViewForWebContents(WebContents* web_contents) {
   // View hierarchy of the contents view:
   // NSView  -- switchView, same for all tabs
   // +- NSView  -- TabContentsController's view
   //    +- TabContentsViewCocoa
   //
   // Changing it? Do not forget to modify
   // -[TabStripController swapInTabAtIndex:] too.
   return [web_contents->GetView()->GetNativeView() superview];
 }