Move Extension into extensions namespace

chrome/browser/themes/theme_service.h

Index: chrome/browser/themes/theme_service.h
diff --git a/chrome/browser/themes/theme_service.h b/chrome/browser/themes/theme_service.h
index c5cc1bad65b02d6f4cb0a03d418fd30cf6a0054f..f9c7b3094525925b2c793bfec21b42b402825d44 100644
--- a/chrome/browser/themes/theme_service.h
+++ b/chrome/browser/themes/theme_service.h
@@ -21,7 +21,6 @@
 
 class BrowserThemePack;
 class ThemeServiceTest;
-class Extension;
 class FilePath;
 class Profile;
 
@@ -29,6 +28,10 @@ namespace color_utils {
 struct HSL;
 }
 
+namespace extensions {
+class Extension;
+}
+
 namespace gfx {
 class Image;
 }
@@ -178,7 +181,7 @@ class ThemeService : public base::NonThreadSafe,
 #endif
 
   // Set the current theme to the theme defined in |extension|.
-  virtual void SetTheme(const Extension* extension);
+  virtual void SetTheme(const extensions::Extension* extension);
 
   // Reset the theme to default.
   virtual void UseDefaultTheme();
@@ -281,7 +284,7 @@ class ThemeService : public base::NonThreadSafe,
 
   // Implementation of SetTheme() (and the fallback from LoadThemePrefs() in
   // case we don't have a theme pack).
-  void BuildFromExtension(const Extension* extension);
+  void BuildFromExtension(const extensions::Extension* extension);
 
 #if defined(TOOLKIT_GTK)
   // Loads an image and flips it horizontally if |rtl_enabled| is true.