Remove deprecated Ozone initialization functions.

ui/ozone/public/ozone_platform.cc

Index: ui/ozone/public/ozone_platform.cc
diff --git a/ui/ozone/public/ozone_platform.cc b/ui/ozone/public/ozone_platform.cc
index 04caf81d9df022dbe3a980c493ef535f150dd5be..ff426d5c26c7109e145e2bf2b63dac2cca32d1a0 100644
--- a/ui/ozone/public/ozone_platform.cc
+++ b/ui/ozone/public/ozone_platform.cc
@@ -85,15 +85,6 @@ OzonePlatform* OzonePlatform::EnsureInstance() {
 // static
 OzonePlatform* OzonePlatform::instance_;
 
-// Convenience methods to facilitate transitionning to new API.
-void OzonePlatform::InitializeUI(const InitParams& args) {
-  InitializeUI();
-}
-
-void OzonePlatform::InitializeGPU(const InitParams& args) {
-  InitializeGPU();
-}
-
 IPC::MessageFilter* OzonePlatform::GetGpuMessageFilter() {
   return nullptr;
 }