Remove methods from WebGraphicsContext3D that wrap type casts.

components/test_runner/test_plugin.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/test_runner/test_plugin.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 473 matching lines @@
   gl_->UseProgram(scene_.program);
 
   // Bind primitive color.
   float color[4];
   PremultiplyAlpha(scene_.primitive_color, scene_.opacity, color);
   gl_->Uniform4f(scene_.color_location, color[0], color[1], color[2], color[3]);
 
   // Bind primitive vertices.
   gl_->BindBuffer(GL_ARRAY_BUFFER, scene_.vbo);
   gl_->EnableVertexAttribArray(scene_.position_location);
-  context_->vertexAttribPointer(
-      scene_.position_location, 3, GL_FLOAT, GL_FALSE, 0, 0);
+  gl_->VertexAttribPointer(scene_.position_location, 3, GL_FLOAT, GL_FALSE, 0,
+                           nullptr);
   gl_->DrawArrays(GL_TRIANGLES, 0, 3);
 }
 
 unsigned TestPlugin::LoadShader(unsigned type, const std::string& source) {
   unsigned shader = gl_->CreateShader(type);
   if (shader) {
     context_->shaderSource(shader, source.data());
     gl_->CompileShader(shader);
 
     int compiled = 0;
@@ skipping 217 matching lines @@
   return kPluginPersistsMimeType;
 }
 
 bool TestPlugin::IsSupportedMimeType(const blink::WebString& mime_type) {
   return mime_type == TestPlugin::MimeType() ||
          mime_type == PluginPersistsMimeType() ||
          mime_type == CanCreateWithoutRendererMimeType();
 }
 
 }  // namespace test_runner