Remove "reportWheelOverscroll" from Blink settings.

third_party/WebKit/Source/core/frame/Settings.in

 # Defines properties which are available on the Settings object.
 #
 # Please think carefully before adding a new Setting.  Some questions to
 # consider are:
 # - Should this be a RuntimeEnabledFeature instead? Settings are for things
 #   which we support either values of at runtime.  Features are set at renderer
 #   process startup and are never changed. Features also tend to be set to a
 #   value based on the platform or the stability of the code in question, where
 #   as settings both codepaths need to be stable.
 # - How will you ensure test coverage of all relevant values of your setting?
@@ skipping 345 matching lines @@
 textTrackTextColor type=String
 textTrackTextShadow type=String
 textTrackTextSize type=String
 
 # Margin for title-safe placement of cues with overscan, gives top and bottom margin size as
 # percentage of video element height (for horizontal text) into which cues will not be placed.
 textTrackMarginPercentage type=double, initial=0
 
 lowPriorityIframes initial=false
 
-reportWheelOverscroll initial=false
-
 mainResourceOnlyProgress initial=false
 
 # Do we want to try to save screen real estate in the media player by hiding
 # the volume slider / mute button?
 preferHiddenVolumeControls initial=false
 
 # Controls for resource fetch prioritization.
 # Overall rationale and details here: https://docs.google.com/document/d/1bCDuq9H1ih9iNjgzyAL0gpwNFiEP4TZS-YLRp_RuMlc/edit?usp=sharing
 fetchDeferLateScripts initial=false
 fetchIncreaseFontPriority initial=false
@@ skipping 12 matching lines @@
 # The autoplay gesture override experiment is described in crbug.com/487345 .
 autoplayExperimentMode type=String, initial="off"
 
 # When DevTools is emulating mobile device, frame resize may mean device size has changed,
 # which in turn affects media queries.
 resizeIsDeviceSizeChange initial=false
 
 # Whether the browser process sends gesture events for wheel events.
 # Can be removed when crbug.com/598798 is fixed.
 wheelGesturesEnabled initial=false