Move WebstoreInstaller, WebstoreInlineInstaller, related in extensions namespace

chrome/browser/extensions/extension_tab_helper.cc

Index: chrome/browser/extensions/extension_tab_helper.cc
diff --git a/chrome/browser/extensions/extension_tab_helper.cc b/chrome/browser/extensions/extension_tab_helper.cc
index 563236ad43b8e120bc834681d3a074d1858b4796..b7519268e65216b7c820e36104b0858960d2f412 100644
--- a/chrome/browser/extensions/extension_tab_helper.cc
+++ b/chrome/browser/extensions/extension_tab_helper.cc
@@ -253,13 +253,14 @@ void ExtensionTabHelper::OnInlineWebstoreInstall(
     int return_route_id,
     const std::string& webstore_item_id,
     const GURL& requestor_url) {
-  scoped_refptr<WebstoreInlineInstaller> installer(new WebstoreInlineInstaller(
-      web_contents(),
-      install_id,
-      return_route_id,
-      webstore_item_id,
-      requestor_url,
-      this));
+  scoped_refptr<extensions::WebstoreInlineInstaller> installer(
+      new extensions::WebstoreInlineInstaller(
+          web_contents(),
+          install_id,
+          return_route_id,
+          webstore_item_id,
+          requestor_url,
+          this));
   installer->BeginInstall();
 }