Revert of Add subscribeUniform extension pipeline

gpu/command_buffer/service/context_group.h

Index: gpu/command_buffer/service/context_group.h
diff --git a/gpu/command_buffer/service/context_group.h b/gpu/command_buffer/service/context_group.h
index eb53252806783812af9e87764def0441bfcddb52..ae4550cbda0dfc9397d8dafc271ae9afd94de580 100644
--- a/gpu/command_buffer/service/context_group.h
+++ b/gpu/command_buffer/service/context_group.h
@@ -34,7 +34,6 @@
 class ProgramManager;
 class ShaderManager;
 class TextureManager;
-class ValuebufferManager;
 class MemoryTracker;
 struct DisallowedFeatures;
 
@@ -127,10 +126,6 @@
     return renderbuffer_manager_.get();
   }
 
-  ValuebufferManager* valuebuffer_manager() const {
-    return valuebuffer_manager_.get();
-  }
-
   TextureManager* texture_manager() const {
     return texture_manager_.get();
   }
@@ -204,8 +199,6 @@
 
   scoped_ptr<RenderbufferManager> renderbuffer_manager_;
 
-  scoped_ptr<ValuebufferManager> valuebuffer_manager_;
-
   scoped_ptr<TextureManager> texture_manager_;
 
   scoped_ptr<ProgramManager> program_manager_;