Revert "Fix a ton of compiler warnings."

chrome/browser/browser_theme_provider.cc

 // 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.
 
 #include "chrome/browser/browser_theme_provider.h"
 
 #include "base/file_util.h"
 #include "base/gfx/png_decoder.h"
 #include "base/gfx/png_encoder.h"
 #include "base/string_util.h"
@@ skipping 99 matching lines @@
 const SkColor BrowserThemeProvider::kDefaultColorNTPLink =
     SkColorSetRGB(0, 0, 0);
 const SkColor BrowserThemeProvider::kDefaultColorNTPHeader =
     SkColorSetRGB(75, 140, 220);
 const SkColor BrowserThemeProvider::kDefaultColorNTPSection =
     SkColorSetRGB(229, 239, 254);
 const SkColor BrowserThemeProvider::kDefaultColorNTPSectionText =
     SkColorSetRGB(0, 0, 0);
 const SkColor BrowserThemeProvider::kDefaultColorNTPSectionLink =
     SkColorSetRGB(0, 0, 204);
-const SkColor BrowserThemeProvider::kDefaultColorControlBackground = 0u;
-const SkColor BrowserThemeProvider::kDefaultColorButtonBackground = 0u;
+const SkColor BrowserThemeProvider::kDefaultColorControlBackground = NULL;
+const SkColor BrowserThemeProvider::kDefaultColorButtonBackground = NULL;
 
 // Default tints.
 const skia::HSL BrowserThemeProvider::kDefaultTintButtons = { -1, -1, -1 };
 const skia::HSL BrowserThemeProvider::kDefaultTintFrame = { -1, -1, -1 };
 const skia::HSL BrowserThemeProvider::kDefaultTintFrameInactive =
     { -1, -1, 0.75f };
 const skia::HSL BrowserThemeProvider::kDefaultTintFrameIncognito =
     { -1, 0.2f, 0.35f };
 const skia::HSL BrowserThemeProvider::kDefaultTintFrameIncognitoInactive =
     { -1, 0.3f, 0.6f };
@@ skipping 1035 matching lines @@
   // the image_cache_, and have therefore all been deleted in the lines above.
   // TODO(mirandac): make memory management clearer here.
   image_save_cache_.clear();
 }
 
 #if defined(TOOLKIT_VIEWS)
 void BrowserThemeProvider::FreePlatformCaches() {
   // Views (Skia) has no platform image cache to clear.
 }
 #endif