Bug 776876- backout patch to try and fix red. r=backout

gfx/gl/GLContext.h

@@ -52,7 +52,7 @@ namespace mozilla {
 namespace gl {
 class GLContext;
 
-typedef void* SharedTextureHandle;
+typedef uintptr_t SharedTextureHandle;
 
 enum ShaderProgramType {
     RGBALayerProgramType,