Return empty capabilities for devices without permission.

This fixes the issue for audio devices which always report the same
echoCancellation capabilities without permission checks.


Bug: 823826
Change-Id: I2ac336760a843d1ff11f25a1a40fe22a57f356a2
Reviewed-on: https://chromium-review.googlesource.com/971482
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Chandan Padhi <c.padhi@samsung.com>
Cr-Commit-Position: refs/heads/master@{#544667}

third_party/WebKit/Source/modules/mediastream/InputDeviceInfo.cpp

@@ -72,6 +72,11 @@ void InputDeviceInfo::SetVideoInputCapabilities(
 }
 
 void InputDeviceInfo::getCapabilities(MediaTrackCapabilities& capabilities) {
+  // If label is null, permissions have not been given and no capabilities
+  // should be returned.
+  if (label().IsEmpty())
+    return;
+
   capabilities.setDeviceId(deviceId());
   capabilities.setGroupId(groupId());