Revert of gpu: introduce glCopySubTextureCHROMIUM

gpu/blink/webgraphicscontext3d_impl.h

Index: gpu/blink/webgraphicscontext3d_impl.h
diff --git a/gpu/blink/webgraphicscontext3d_impl.h b/gpu/blink/webgraphicscontext3d_impl.h
index a0d14612b3d0c8fe1f79e784edc6692cb06db269..ff2ca9707627dee98b1680931f59e27ba1d8e307 100644
--- a/gpu/blink/webgraphicscontext3d_impl.h
+++ b/gpu/blink/webgraphicscontext3d_impl.h
@@ -451,32 +451,10 @@
   virtual void getQueryObjectuivEXT(
       WebGLId query, WGC3Denum pname, WGC3Duint* params);
 
-  // TODO(dshwang): Remove |level| in Blink and then remove it.
-  void copyTextureCHROMIUM(WGC3Denum target,
-                           WebGLId source_id,
-                           WebGLId dest_id,
-                           WGC3Dint level,
-                           WGC3Denum internal_format,
-                           WGC3Denum dest_type) override;
-
-  void copySubTextureCHROMIUM(WGC3Denum target,
-                              WebGLId source_id,
-                              WebGLId dest_id,
-                              WGC3Dint level,
-                              WGC3Dint xoffset,
-                              WGC3Dint yoffset) override;
-
-  virtual void copyTextureCHROMIUM(WGC3Denum target,
-                                   WebGLId source_id,
-                                   WebGLId dest_id,
+  virtual void copyTextureCHROMIUM(WGC3Denum target, WebGLId source_id,
+                                   WebGLId dest_id, WGC3Dint level,
                                    WGC3Denum internal_format,
                                    WGC3Denum dest_type);
-
-  virtual void copySubTextureCHROMIUM(WGC3Denum target,
-                                      WebGLId sourceId,
-                                      WebGLId destId,
-                                      WGC3Dint xoffset,
-                                      WGC3Dint yoffset);
 
   virtual void bindUniformLocationCHROMIUM(WebGLId program, WGC3Dint location,
                                            const WGC3Dchar* uniform);