Change the battery-status layout tests to use JS mocks.

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 856241b8d4aa735cf4ff6c147acc0c11ce913c3a..4f722a4a35a3d3dc35d7374f30364f8eb1aecf4f 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -1168,14 +1168,6 @@ void RendererBlinkPlatformImpl::SetPlatformEventObserverForTesting(
 void RendererBlinkPlatformImpl::connectToRemoteService(
     const char* name,
     mojo::ScopedMessagePipeHandle handle) {
-  // In the layout test mode, mock services should be used instead.
-  // TODO(yukishiino): We'd like to inject mock services implemented in
-  // JavaScript.  Remove the following hack once we support JS-bindings
-  // of Mojo and service mocking in JS.
-  if (RenderThreadImpl::current() &&
-      RenderThreadImpl::current()->layout_test_mode())
-    return;
-
   RenderThread::Get()->GetServiceRegistry()->ConnectToRemoteService(
       name, std::move(handle));
 }