Revert 123696 - Add Pepper support for several GL extensions

ppapi/shared_impl/ppb_graphics_3d_shared.cc

Index: ppapi/shared_impl/ppb_graphics_3d_shared.cc
===================================================================
--- ppapi/shared_impl/ppb_graphics_3d_shared.cc	(revision 123696)
+++ ppapi/shared_impl/ppb_graphics_3d_shared.cc	(working copy)
@@ -71,6 +71,23 @@
   return DoSwapBuffers();
 }
 
+void* PPB_Graphics3D_Shared::MapTexSubImage2DCHROMIUM(GLenum target,
+                                                      GLint level,
+                                                      GLint xoffset,
+                                                      GLint yoffset,
+                                                      GLsizei width,
+                                                      GLsizei height,
+                                                      GLenum format,
+                                                      GLenum type,
+                                                      GLenum access) {
+  return gles2_impl_->MapTexSubImage2DCHROMIUM(
+      target, level, xoffset, yoffset, width, height, format, type, access);
+}
+
+void PPB_Graphics3D_Shared::UnmapTexSubImage2DCHROMIUM(const void* mem) {
+  gles2_impl_->UnmapTexSubImage2DCHROMIUM(mem);
+}
+
 void PPB_Graphics3D_Shared::SwapBuffersACK(int32_t pp_error) {
   DCHECK(HasPendingSwap());
   TrackedCallback::ClearAndRun(&swap_callback_, pp_error);