Remove premultipliedAlpha from WebGraphicsContext3D::Attributes.

third_party/WebKit/Source/modules/webgl/WebGLContextAttributeHelpers.cpp

 // Copyright 2014 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 "modules/webgl/WebGLContextAttributeHelpers.h"
 
 #include "core/frame/Settings.h"
 
 namespace blink {
 
@@ skipping 14 matching lines @@
 {
     WebGraphicsContext3D::Attributes result;
     result.alpha = attrs.alpha();
     result.depth = attrs.depth();
     result.stencil = attrs.stencil();
     result.antialias = attrs.antialias();
     if (attrs.antialias()) {
         if (settings && !settings->openGLMultisamplingEnabled())
             result.antialias = false;
     }
-    result.premultipliedAlpha = attrs.premultipliedAlpha();
     result.failIfMajorPerformanceCaveat = attrs.failIfMajorPerformanceCaveat();
 
     result.shareResources = false;
     result.preferDiscreteGPU = true;
 
     result.topDocumentURL = topDocumentURL;
 
     result.webGLVersion = webGLVersion;
     return result;
 }
 
 } // namespace blink