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

ui/gl/gl_share_group.h

Index: ui/gl/gl_share_group.h
diff --git a/ui/gl/gl_share_group.h b/ui/gl/gl_share_group.h
index 1deed63c541c1584becd2fa0fc954f6392a5d8e9..e069d657e62f3d40a7573878ff8fafa151151c88 100644
--- a/ui/gl/gl_share_group.h
+++ b/ui/gl/gl_share_group.h
@@ -38,13 +38,6 @@ class GL_EXPORT GLShareGroup : public base::RefCounted<GLShareGroup> {
   void SetSharedContext(GLContext* context);
   GLContext* GetSharedContext();
 
-#if defined(OS_MACOSX)
-  // Sets and returns the ID of the renderer that all contexts in this share
-  // group should be on.
-  void SetRendererID(int renderer_id);
-  int GetRendererID();
-#endif
-
  private:
   friend class base::RefCounted<GLShareGroup>;
 
@@ -57,10 +50,6 @@ class GL_EXPORT GLShareGroup : public base::RefCounted<GLShareGroup> {
 
   GLContext* shared_context_;
 
-#if defined(OS_MACOSX)
-  int renderer_id_;
-#endif
-
   DISALLOW_COPY_AND_ASSIGN(GLShareGroup);
 };