Move 'theme' parsing out of Extension class

chrome/browser/themes/theme_service.cc

Index: chrome/browser/themes/theme_service.cc
diff --git a/chrome/browser/themes/theme_service.cc b/chrome/browser/themes/theme_service.cc
index 046784e227cfbc20e3130c7e225ef38e370d7957..9bc0702f5208459dc0d26ec30e7c5d599551dccc 100644
--- a/chrome/browser/themes/theme_service.cc
+++ b/chrome/browser/themes/theme_service.cc
@@ -18,6 +18,9 @@
 #include "chrome/browser/themes/theme_syncable_service.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/extensions/extension_manifest_constants.h"
+#include "chrome/common/extensions/manifest_handler.h"
+#include "chrome/common/extensions/theme_handler.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/user_metrics.h"
@@ -214,6 +217,10 @@ ThemeService::ThemeService()
       number_of_infobars_(0) {
   // Initialize the themeable image map so we can use it on other threads.
   HasThemeableImage(0);
+
+  // Register the ManifestHandler for parsing 'theme' manifest key.
+  extensions::ManifestHandler::Register(extension_manifest_keys::kTheme,
+                                        new extensions::ThemeHandler);
 }
 
 ThemeService::~ThemeService() {