Remove the default wheel event handler from blink.

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?
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 # frame inserted via document.write, regardless of connection type.
 disallowFetchForDocWrittenScriptsInMainFrame initial=false
 
 # 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
-
 # If set to a positive value, emit a console warning once for each non-passive
 # event listener that caused an event to be dispatched to main thread and
 # delayed by more than the specified time (in seconds).
 blockedMainThreadEventsWarningThreshold type=double, initial=0
 
 # Ability to override the default 'passive' value in AddEventListenerOptions. This
 # is useful to demonstrate the power of passive event listeners. This can be removed
 # when there is greater adoption, interventions to force it on and associated devtools
 # to enable it have been shipped.
 passiveListenerDefault type=PassiveListenerDefault, initial=PassiveListenerDefault::False