Reland of Fix initialization ordering in GLES2CmdDecoder.

gpu/command_buffer/tests/gl_manager.h

Index: gpu/command_buffer/tests/gl_manager.h
diff --git a/gpu/command_buffer/tests/gl_manager.h b/gpu/command_buffer/tests/gl_manager.h
index 6a45db4c52c58454188ce6468274b7612809728a..1c8175bf41f9cdd7bb8a85faa9c4dbeba315cc8e 100644
--- a/gpu/command_buffer/tests/gl_manager.h
+++ b/gpu/command_buffer/tests/gl_manager.h
@@ -82,8 +82,6 @@
     bool backbuffer_alpha;
     // The ImageFactory to use to generate images for the backbuffer.
     gpu::ImageFactory* image_factory;
-    // Enable the feature |arb_texture_rectangle|.
-    bool enable_arb_texture_rectangle;
   };
   GLManager();
   ~GLManager() override;