Remove the MSAA WebSetting, which is not read or used.

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

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 817 matching lines @@
     , m_contextLostMode(NotLostContext)
     , m_autoRecoveryMethod(Manual)
     , m_dispatchContextLostEventTimer(this, &WebGLRenderingContextBase::dispatchContextLostEvent)
     , m_restoreAllowed(false)
     , m_restoreTimer(this, &WebGLRenderingContextBase::maybeRestoreContext)
     , m_preservedDefaultVAOObjectWrapper(false)
     , m_generatedImageCache(4)
     , m_requestedAttributes(requestedAttributes)
     , m_synthesizedErrorsToConsole(true)
     , m_numGLErrorsToConsoleAllowed(maxGLErrorsAllowedToConsole)
-    , m_multisamplingAllowed(false)
-    , m_multisamplingObserverRegistered(false)
     , m_onePlusMaxNonDefaultTextureUnit(0)
     , m_isWebGL2FormatsTypesAdded(false)
     , m_isWebGL2InternalFormatsCopyTexImageAdded(false)
     , m_isOESTextureFloatFormatsTypesAdded(false)
     , m_isOESTextureHalfFloatFormatsTypesAdded(false)
     , m_isWebGLDepthTextureFormatsTypesAdded(false)
     , m_isEXTsRGBFormatsTypesAdded(false)
 #if !ENABLE(OILPAN)
     , m_weakPtrFactory(this)
 #endif
@@ skipping 163 matching lines @@
     ADD_VALUES_TO_SET(m_supportedTypes, kSupportedTypesES2);
 
     activateContext(this);
 }
 
 void WebGLRenderingContextBase::setupFlags()
 {
     ASSERT(drawingBuffer());
     if (Page* p = canvas()->document().page()) {
         m_synthesizedErrorsToConsole = p->settings().webGLErrorsToConsoleEnabled();
-
-        if (!m_multisamplingObserverRegistered && m_requestedAttributes.antialias()) {
-            m_multisamplingAllowed = drawingBuffer()->multisample();
-            p->addMultisamplingChangedObserver(this);
-            m_multisamplingObserverRegistered = true;
-        }
     }
 
     m_isDepthStencilSupported = extensionsUtil()->isExtensionEnabled("GL_OES_packed_depth_stencil");
 }
 
 void WebGLRenderingContextBase::addCompressedTextureFormat(GLenum format)
 {
     if (!m_compressedTextureFormats.contains(format))
         m_compressedTextureFormats.append(format);
 }
@@ skipping 40 matching lines @@
         tracker->loseExtension(true);
     }
     m_extensions.clear();
 
     // Context must be removed from the group prior to the destruction of the
     // WebGraphicsContext3D, otherwise shared objects may not be properly deleted.
     m_contextGroup->removeContext(this);
 
     destroyContext();
 
-#if !ENABLE(OILPAN)
-    if (m_multisamplingObserverRegistered) {
-        if (Page* page = canvas()->document().page())
-            page->removeMultisamplingChangedObserver(this);
-    }
-#endif
-
     willDestroyContext(this);
 }
 
 void WebGLRenderingContextBase::destroyContext()
 {
     if (!drawingBuffer())
         return;
 
     m_extensionsUtil.clear();
 
@@ skipping 5108 matching lines @@
 void WebGLRenderingContextBase::restoreCurrentFramebuffer()
 {
     bindFramebuffer(nullptr, GL_FRAMEBUFFER, m_framebufferBinding.get());
 }
 
 void WebGLRenderingContextBase::restoreCurrentTexture2D()
 {
     bindTexture(nullptr, GL_TEXTURE_2D, m_textureUnits[m_activeTextureUnit].m_texture2DBinding.get());
 }
 
-void WebGLRenderingContextBase::multisamplingChanged(bool enabled)
-{
-    if (m_multisamplingAllowed != enabled) {
-        m_multisamplingAllowed = enabled;
-        forceLostContext(WebGLRenderingContextBase::SyntheticLostContext, WebGLRenderingContextBase::Auto);
-    }
-}
-
 void WebGLRenderingContextBase::findNewMaxNonDefaultTextureUnit()
 {
     // Trace backwards from the current max to find the new max non-default texture unit
     int startIndex = m_onePlusMaxNonDefaultTextureUnit - 1;
     for (int i = startIndex; i >= 0; --i) {
         if (m_textureUnits[i].m_texture2DBinding
             || m_textureUnits[i].m_textureCubeMapBinding) {
             m_onePlusMaxNonDefaultTextureUnit = i + 1;
             return;
         }
@@ skipping 110 matching lines @@
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, 1);
 }
 
 void WebGLRenderingContextBase::restoreUnpackParameters()
 {
     if (m_unpackAlignment != 1)
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
 }
 
 } // namespace blink