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

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 926 matching lines @@
   // universal access. Only test shell will enable this.
   settings->setAllowUniversalAccessFromFileURLs(
       prefs.allow_universal_access_from_file_urls);
   settings->setAllowFileAccessFromFileURLs(
       prefs.allow_file_access_from_file_urls);
 
   // Enable experimental WebGL support if requested on command line
   // and support is compiled in.
   settings->setExperimentalWebGLEnabled(prefs.experimental_webgl_enabled);
 
-  // Disable GL multisampling if requested on command line.
-  settings->setOpenGLMultisamplingEnabled(prefs.gl_multisampling_enabled);
-
   // Enable WebGL errors to the JS console if requested.
   settings->setWebGLErrorsToConsoleEnabled(
       prefs.webgl_errors_to_console_enabled);
 
   // Uses the mock theme engine for scrollbars.
   settings->setMockScrollbarsEnabled(prefs.mock_scrollbars_enabled);
 
   // Enable gpu-accelerated 2d canvas if requested on the command line.
   settings->setAccelerated2dCanvasEnabled(prefs.accelerated_2d_canvas_enabled);
 
@@ skipping 2481 matching lines @@
   if (IsUseZoomForDSFEnabled()) {
     webview()->setZoomFactorForDeviceScaleFactor(device_scale_factor_);
   } else {
     webview()->setDeviceScaleFactor(device_scale_factor_);
   }
   webview()->settings()->setPreferCompositingToLCDTextEnabled(
       PreferCompositingToLCDText(compositor_deps_, device_scale_factor_));
 }
 
 }  // namespace content