Purge the ScrollBlocksOn code.

third_party/WebKit/public/blink_headers.gypi

 # Copyright 2015 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.
 
 {
   'variables': {
     'blink_public_sources': [
       "platform/Platform.h",
       "platform/URLConversion.h",
       "platform/WebApiKeyValidator.h",
@@ skipping 169 matching lines @@
       "platform/WebRTCSessionDescription.h",
       "platform/WebRTCSessionDescriptionRequest.h",
       "platform/WebRTCStatsRequest.h",
       "platform/WebRTCStatsResponse.h",
       "platform/WebRTCVoidRequest.h",
       "platform/WebRect.h",
       "platform/WebReferrerPolicy.h",
       "platform/WebRenderingStats.h",
       "platform/WebScheduler.h",
       "platform/WebScreenInfo.h",
-      "platform/WebScrollBlocksOn.h",
       "platform/WebScrollOffsetAnimationCurve.h",
       "platform/WebScrollbar.h",
       "platform/WebScrollbarBehavior.h",
       "platform/WebScrollbarButtonsPlacement.h",
       "platform/WebScrollbarLayer.h",
       "platform/WebScrollbarThemeGeometry.h",
       "platform/WebScrollbarThemePainter.h",
       "platform/WebScrollStateData.h",
       "platform/WebSecurityOrigin.h",
       "platform/WebSelectionBound.h",
@@ skipping 322 matching lines @@
       "web/modules/serviceworker/WebServiceWorkerContextClient.h",
       "web/modules/serviceworker/WebServiceWorkerContextProxy.h",
       "web/modules/serviceworker/WebServiceWorkerNetworkProvider.h",
       "web/modules/webmidi/WebMIDIClient.h",
       "web/modules/webmidi/WebMIDIOptions.h",
       "web/modules/webmidi/WebMIDIPermissionRequest.h",
       "web/win/WebFontRendering.h",
     ],
   },
 }