Revert "Fix a ton of compiler warnings."

chrome/browser/browser_theme_provider.cc

Index: chrome/browser/browser_theme_provider.cc
diff --git a/chrome/browser/browser_theme_provider.cc b/chrome/browser/browser_theme_provider.cc
index ee361e9bdc9f270c2d6bc461e8959f694703fc60..ec4054bf3e325cd6d2d677197cd534343b2818d4 100644
--- a/chrome/browser/browser_theme_provider.cc
+++ b/chrome/browser/browser_theme_provider.cc
@@ -117,8 +117,8 @@ 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 };