Move Extension into extensions namespace

chrome/browser/extensions/webstore_inline_installer.h

Index: chrome/browser/extensions/webstore_inline_installer.h
diff --git a/chrome/browser/extensions/webstore_inline_installer.h b/chrome/browser/extensions/webstore_inline_installer.h
index 9a8cd6054c70d51952eb7340d89f138492fe7c8f..bd35456613a5855f0df8f4fa1ebf8b0442a1c3f5 100644
--- a/chrome/browser/extensions/webstore_inline_installer.h
+++ b/chrome/browser/extensions/webstore_inline_installer.h
@@ -21,6 +21,10 @@
 
 class SafeWebstoreResponseParser;
 
+namespace extensions {
+class Extension;
+}
+
 // Manages inline installs requested by a page (downloads and parses metadata
 // from the webstore, shows the install UI, starts the download once the user
 // confirms).  Clients must implement the WebstoreInlineInstaller::Delegate
@@ -127,7 +131,7 @@ class WebstoreInlineInstaller
   int rating_count_;
   scoped_ptr<DictionaryValue> webstore_data_;
   scoped_ptr<DictionaryValue> manifest_;
-  scoped_refptr<Extension> dummy_extension_;
+  scoped_refptr<extensions::Extension> dummy_extension_;
   SkBitmap icon_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebstoreInlineInstaller);