Various optimizations to reduce the number of temporary allocations.

chrome/browser/themes/theme_properties.h

Index: chrome/browser/themes/theme_properties.h
diff --git a/chrome/browser/themes/theme_properties.h b/chrome/browser/themes/theme_properties.h
index 3a34e8bad4f784e7f76058a5b14d4a7bb1b9f64a..530315c1ae361af1b5292287a40f0283306dfbcc 100644
--- a/chrome/browser/themes/theme_properties.h
+++ b/chrome/browser/themes/theme_properties.h
@@ -129,9 +129,6 @@ class ThemeProperties {
   // generate a CSS value.
   static std::string TilingToString(int tiling);
 
-  // Returns true if the image is themeable.
-  static bool IsThemeableImage(int resource_id);
-
   // Returns the set of IDR_* resources that should be tinted.
   // This method is not thread safe.
   static const std::set<int>& GetTintableToolbarButtons();