Move ExtensionHost into extensions namespace

chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h

Index: chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h
diff --git a/chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h b/chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h
index 05bdc2be7c8c1db2a9314204985398adfd16109c..a01de88bbec34d284173e612d159360a1535176e 100644
--- a/chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h
+++ b/chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h
@@ -9,7 +9,9 @@ namespace content {
 class JavaScriptDialogCreator;
 }
 
+namespace extensions {
 class ExtensionHost;
+}
 
 // Returns a JavaScriptDialogCreator that creates real dialogs.
 // It returns a Singleton instance of JavaScriptDialogCreator,
@@ -19,6 +21,6 @@ content::JavaScriptDialogCreator* GetJavaScriptDialogCreatorInstance();
 // Creates and returns a JavaScriptDialogCreator owned by |extension_host|.
 // This is not the Singleton instance, so the caller must delete it.
 content::JavaScriptDialogCreator* CreateJavaScriptDialogCreatorInstance(
-    ExtensionHost* extension_host);
+    extensions::ExtensionHost* extension_host);
 
 #endif  // CHROME_BROWSER_UI_APP_MODAL_DIALOGS_JAVASCRIPT_DIALOG_CREATOR_H_