Remove windows/mac/ios specific code from //ui

ui/gl/gl_share_group.cc

Index: ui/gl/gl_share_group.cc
diff --git a/ui/gl/gl_share_group.cc b/ui/gl/gl_share_group.cc
index 8e8958b49a42179c15d2b96811e6006a96554dac..0ad4a7176b5bc3e719d374c8fea44b5417c4c22d 100644
--- a/ui/gl/gl_share_group.cc
+++ b/ui/gl/gl_share_group.cc
@@ -9,12 +9,7 @@
 
 namespace gfx {
 
-GLShareGroup::GLShareGroup()
-    : shared_context_(NULL)
-#if defined(OS_MACOSX)
-    , renderer_id_(-1)
-#endif
-    {
+GLShareGroup::GLShareGroup() : shared_context_(NULL) {
 }
 
 void GLShareGroup::AddContext(GLContext* context) {
@@ -55,16 +50,6 @@ GLContext* GLShareGroup::GetSharedContext() {
   return shared_context_;
 }
 
-#if defined(OS_MACOSX)
-void GLShareGroup::SetRendererID(int renderer_id) {
-  renderer_id_ = renderer_id;
-}
-
-int GLShareGroup::GetRendererID() {
-  return renderer_id_;
-}
-#endif
-
 GLShareGroup::~GLShareGroup() {
 }