[sensor] Fix origin in SensorProviderProxyImpl::CheckPermission()

Origin must be extracted from the URL before it is passed to
GetPermissionStatusForFrame().

Bug: 750018
Change-Id: Iffffbf4ec516cb1a798c3604333a71d3bdac5e9e
Reviewed-on: https://chromium-review.googlesource.com/998160Reviewed-by: Alexander Shalamov <alexander.shalamov@intel.com>
Commit-Queue: Mikhail Pozdnyakov <mikhail.pozdnyakov@intel.com>
Cr-Commit-Position: refs/heads/master@{#548781}

content/browser/generic_sensor/sensor_provider_proxy_impl.cc

@@ -66,7 +66,8 @@ void SensorProviderProxyImpl::GetSensor(SensorType type,
 }
 
 bool SensorProviderProxyImpl::CheckPermission() const {
-  const GURL& requesting_origin = render_frame_host_->GetLastCommittedURL();
+  const GURL& requesting_origin =
+      render_frame_host_->GetLastCommittedURL().GetOrigin();
 
   blink::mojom::PermissionStatus permission_status =
       permission_manager_->GetPermissionStatusForFrame(