Linux: Fix some GdkPixbuf leaks.

chrome/browser/browser_theme_provider.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_
 #define CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 112 matching lines @@
 
   // ThemeProvider implementation.
   virtual void Init(Profile* profile);
   virtual SkBitmap* GetBitmapNamed(int id) const;
   virtual SkColor GetColor(int id) const;
   virtual bool GetDisplayProperty(int id, int* result) const;
   virtual bool ShouldUseNativeFrame() const;
   virtual bool HasCustomImage(int id) const;
   virtual RefCountedMemory* GetRawData(int id) const;
 #if defined(OS_LINUX)
+  // GdkPixbufs returned by GetPixbufNamed and GetRTLEnabledPixbufNamed are
+  // shared instances owned by the theme provider and should not be freed.
   virtual GdkPixbuf* GetPixbufNamed(int id) const;
   virtual GdkPixbuf* GetRTLEnabledPixbufNamed(int id) const;
 #elif defined(OS_MACOSX)
   virtual NSImage* GetNSImageNamed(int id, bool allow_default) const;
   virtual NSColor* GetNSImageColorNamed(int id, bool allow_default) const;
   virtual NSColor* GetNSColor(int id, bool allow_default) const;
   virtual NSColor* GetNSColorTint(int id, bool allow_default) const;
   virtual NSGradient* GetNSGradient(int id) const;
 #endif
 
@@ skipping 115 matching lines @@
 
   scoped_refptr<BrowserThemePack> theme_pack_;
 
   // The number of infobars currently displayed.
   int number_of_infobars_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserThemeProvider);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_