Extensions: Split extensions utility IPC messages into its own file.

chrome/browser/extensions/chrome_extensions_browser_client.cc

Index: chrome/browser/extensions/chrome_extensions_browser_client.cc
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
index dc7cfafa47ba2745b7c46a223a1c061baf98753a..3f21436a6b21df6001592045a8de1d8207c4dfe1 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -280,8 +280,12 @@ ChromeExtensionsBrowserClient::GetComponentExtensionResourceManager() {
 scoped_ptr<extensions::RuntimeAPIDelegate>
 ChromeExtensionsBrowserClient::CreateRuntimeAPIDelegate(
     content::BrowserContext* context) const {
+#if defined(ENABLE_EXTENSIONS)
   return scoped_ptr<extensions::RuntimeAPIDelegate>(
       new ChromeRuntimeAPIDelegate(context));
+#else
+  return scoped_ptr<extensions::RuntimeAPIDelegate>();
+#endif
 }
 
 }  // namespace extensions