Remove dependency of chrome in WebRequestPermissions.

extensions/browser/api/extensions_api_client.cc

Index: extensions/browser/api/extensions_api_client.cc
diff --git a/extensions/browser/api/extensions_api_client.cc b/extensions/browser/api/extensions_api_client.cc
index b75428d2322065672de7ea33d5c413c8b496073f..7ac00eb207afcc6a27ae7819cdfe9e7d48ca518f 100644
--- a/extensions/browser/api/extensions_api_client.cc
+++ b/extensions/browser/api/extensions_api_client.cc
@@ -51,6 +51,11 @@ device::HidService* ExtensionsAPIClient::GetHidService() {
   return NULL;
 }
 
+WebRequestPermissionsDelegate* ExtensionsAPIClient::
+    CreateWebRequestPermissionsDelegate() const {
+  return NULL;
+}
+
 WebViewGuestDelegate* ExtensionsAPIClient::CreateWebViewGuestDelegate(
     WebViewGuest* web_view_guest) const {
   return NULL;