Revert of Implement helper functionalities for computing image size with ES3 settings.

gpu/command_buffer/service/context_state.h

Index: gpu/command_buffer/service/context_state.h
diff --git a/gpu/command_buffer/service/context_state.h b/gpu/command_buffer/service/context_state.h
index e1fa4a4bb3c33d5f0f4cca98af2eb4727018ccc5..5f154c28a73eb90bcec864f3cee7399585da8f1e 100644
--- a/gpu/command_buffer/service/context_state.h
+++ b/gpu/command_buffer/service/context_state.h
@@ -138,11 +138,6 @@
 GPU_EXPORT void Vec4::SetValues<GLuint>(const GLuint* values);
 
 struct GPU_EXPORT ContextState {
-  enum Dimension {
-    k2D,
-    k3D
-  };
-
   ContextState(FeatureInfo* feature_info,
                ErrorStateClient* error_state_client,
                Logger* logger);
@@ -225,9 +220,6 @@
   void UnbindTexture(TextureRef* texture);
   void UnbindSampler(Sampler* sampler);
 
-  PixelStoreParams GetPackParams();
-  PixelStoreParams GetUnpackParams(Dimension dimension);
-
   #include "gpu/command_buffer/service/context_state_autogen.h"
 
   EnableFlags enable_flags;