Revert 123696 - Add Pepper support for several GL extensions

ppapi/shared_impl/ppb_graphics_3d_shared.h

Index: ppapi/shared_impl/ppb_graphics_3d_shared.h
===================================================================
--- ppapi/shared_impl/ppb_graphics_3d_shared.h	(revision 123696)
+++ ppapi/shared_impl/ppb_graphics_3d_shared.h	(working copy)
@@ -37,6 +37,16 @@
   virtual int32_t GetError() OVERRIDE;
   virtual int32_t ResizeBuffers(int32_t width, int32_t height) OVERRIDE;
   virtual int32_t SwapBuffers(PP_CompletionCallback callback) OVERRIDE;
+  virtual void* MapTexSubImage2DCHROMIUM(GLenum target,
+                                         GLint level,
+                                         GLint xoffset,
+                                         GLint yoffset,
+                                         GLsizei width,
+                                         GLsizei height,
+                                         GLenum format,
+                                         GLenum type,
+                                         GLenum access) OVERRIDE;
+  virtual void UnmapTexSubImage2DCHROMIUM(const void* mem) OVERRIDE;
 
   gpu::gles2::GLES2Implementation* gles2_impl() {
     return gles2_impl_.get();