Apply the same logic with one of ChromeResourceDispatcherHostDelegate

https://codereview.chromium.org/1056913008 modified codes to carry over
a user gesture bit for all the non-main frame request types.
The same logic should be applied to AwResourceDispatcherHostDelegate.

BUG=478972

Review URL: https://codereview.chromium.org/1106333002

Cr-Commit-Position: refs/heads/master@{#327382}

android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.cc

@@ -232,7 +232,7 @@ void AwResourceDispatcherHostDelegate::RequestBeginning(
   if (resource_type == content::RESOURCE_TYPE_MAIN_FRAME) {
     throttles->push_back(InterceptNavigationDelegate::CreateThrottleFor(
         request));
-  } else if (resource_type == content::RESOURCE_TYPE_XHR) {
+  } else {
     InterceptNavigationDelegate::UpdateUserGestureCarryoverInfo(request);
   }
 }