Remove testing early return in RenderFrame::willSendRequest

Noticed this while reading some random code. Nothing appears
to actually depend on this early return, so just remove it.

BUG=none

Review-Url: https://codereview.chromium.org/2390353002
Cr-Commit-Position: refs/heads/master@{#423048}

content/renderer/render_frame_impl.cc

@@ -3962,9 +3962,6 @@ void RenderFrameImpl::saveImageFromDataURL(const blink::WebString& data_url) {
 void RenderFrameImpl::willSendRequest(blink::WebLocalFrame* frame,
                                       blink::WebURLRequest& request) {
   DCHECK_EQ(frame_, frame);
-  // The request my be empty during tests.
-  if (request.url().isEmpty())
-    return;
 
   // Set the first party for cookies url if it has not been set yet (new
   // requests). This value will be updated during redirects, consistent with