override chrome:// URLs via extensions.

chrome/browser/extensions/extensions_service.cc

Index: chrome/browser/extensions/extensions_service.cc
diff --git a/chrome/browser/extensions/extensions_service.cc b/chrome/browser/extensions/extensions_service.cc
index d389aa6675b9cf4f7b212c8252dd69bd96f5da1d..3243a28127142ca3aff64776b0b35fa9ff7170b1 100644
--- a/chrome/browser/extensions/extensions_service.cc
+++ b/chrome/browser/extensions/extensions_service.cc
@@ -11,6 +11,7 @@
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_browser_event_router.h"
+#include "chrome/browser/extensions/extension_dom_ui.h"
 #include "chrome/browser/extensions/extension_file_util.h"
 #include "chrome/browser/extensions/extension_updater.h"
 #include "chrome/browser/extensions/external_extension_provider.h"
@@ -193,6 +194,9 @@ void ExtensionsService::UninstallExtension(const std::string& extension_id,
       install_directory_));
   }
 
+  ExtensionDOMUI::UnregisterChromeURLOverrides(profile_,
+      extension->GetChromeURLOverrides());
+
   UnloadExtension(extension_id);
 }
 
@@ -211,6 +215,9 @@ void ExtensionsService::EnableExtension(const std::string& extension_id) {
                                            extension);
   disabled_extensions_.erase(iter);
 
+  ExtensionDOMUI::RegisterChromeURLOverrides(profile_,
+      extension->GetChromeURLOverrides());
+
   NotificationService::current()->Notify(
       NotificationType::EXTENSION_LOADED,
       Source<ExtensionsService>(this),
@@ -312,6 +319,9 @@ void ExtensionsService::UnloadExtension(const std::string& extension_id) {
   // Callers should not send us nonexistant extensions.
   CHECK(extension.get());
 
+  ExtensionDOMUI::UnregisterChromeURLOverrides(profile_,
+      extension->GetChromeURLOverrides());
+
   ExtensionList::iterator iter = std::find(disabled_extensions_.begin(),
                                            disabled_extensions_.end(),
                                            extension.get());
@@ -422,6 +432,9 @@ void ExtensionsService::OnExtensionLoaded(Extension* extension) {
               NotificationType::THEME_INSTALLED,
               Source<ExtensionsService>(this),
               Details<Extension>(extension));
+        } else {
+          ExtensionDOMUI::RegisterChromeURLOverrides(profile_,
+              extension->GetChromeURLOverrides());
         }
         break;
       case Extension::DISABLED: