Replace hide-scrollbars flag with a web setting.

content/child/runtime_features.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 "content/child/runtime_features.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 141 matching lines @@
   bool enable_web_gl_image_chromium =
       command_line.HasSwitch(switches::kEnableWebGLImageChromium);
 #endif
   WebRuntimeFeatures::enableWebGLImageChromium(enable_web_gl_image_chromium);
 
   if (command_line.HasSwitch(switches::kForceOverlayFullscreenVideo))
     WebRuntimeFeatures::forceOverlayFullscreenVideo(true);
 
   if (ui::IsOverlayScrollbarEnabled())
     WebRuntimeFeatures::enableOverlayScrollbars(true);
-  if (ui::ShouldHideScrollbars())
-    WebRuntimeFeatures::enableHideScrollbars(true);
 
   if (command_line.HasSwitch(switches::kEnablePreciseMemoryInfo))
     WebRuntimeFeatures::enablePreciseMemoryInfo(true);
 
   if (command_line.HasSwitch(switches::kEnableNetworkInformation) ||
       command_line.HasSwitch(
           switches::kEnableExperimentalWebPlatformFeatures)) {
     WebRuntimeFeatures::enableNetworkInformation(true);
   }
 
@@ skipping 132 matching lines @@
   if (command_line.HasSwitch(switches::kDisableBlinkFeatures)) {
     std::vector<std::string> disabled_features = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kDisableBlinkFeatures),
         ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     for (const std::string& feature : disabled_features)
       WebRuntimeFeatures::enableFeatureFromString(feature, false);
   }
 }
 
 }  // namespace content