Remove InitializeForUI() from OzonePlatform

ui/aura/env.cc

Index: ui/aura/env.cc
diff --git a/ui/aura/env.cc b/ui/aura/env.cc
index 9436b2be50f4a95bc40322d8bef9a0a43b4b202c..a6d648218518231042dfdadd8fae2fc1fa10a654 100644
--- a/ui/aura/env.cc
+++ b/ui/aura/env.cc
@@ -205,7 +205,9 @@ void Env::Init() {
   // The ozone platform can provide its own event source. So initialize the
   // platform before creating the default event source. If running inside mus
   // let the mus process initialize ozone instead.
-  ui::OzonePlatform::InitializeForUI();
+  ui::OzonePlatform::InitParams params;
+  params.single_process = false;

[spang, 2017/03/24 15:24:15]

This doesn't really make a whole lot of sense; aura can be used with or without
a gpu process.

It might be worth trying to get rid of this one, and add separate initializers
for all the tests that are depending on this being here.

[Chandan, 2017/03/27 11:06:40]

Acknowledged.

+  ui::OzonePlatform::InitializeForUI(params);
 #endif
   if (!ui::PlatformEventSource::GetInstance())
     event_source_ = ui::PlatformEventSource::CreateDefault();