Delete copy_texture_to_parent_texture from GPU command buffer code.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc

Index: content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc
===================================================================
--- content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc	(revision 96009)
+++ content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc	(working copy)
@@ -132,6 +132,7 @@
     context_ = RendererGLContext::CreateViewContext(
         host,
         renderview->routing_id(),
+        !attributes.noExtensions,
         share_group,
         preferred_extensions,
         attribs,
@@ -145,6 +146,7 @@
     context_ = RendererGLContext::CreateOffscreenContext(
         host,
         gfx::Size(1, 1),
+        !attributes.noExtensions,
         share_group,
         preferred_extensions,
         attribs,
@@ -363,9 +365,7 @@
 
 void WebGraphicsContext3DCommandBufferImpl::copyTextureToParentTextureCHROMIUM(
     WebGLId texture, WebGLId parentTexture) {
-  TRACE_EVENT0("gpu", "WebGfxCtx3DCmdBfrImpl::copyTextureToCompositor");
-  gl_->CopyTextureToParentTextureCHROMIUM(texture, parentTexture);
-  gl_->Flush();
+  NOTIMPLEMENTED();
 }
 
 void WebGraphicsContext3DCommandBufferImpl::