Remove pinch viewports.

sky/engine/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 128 matching lines @@
 selectionIncludesAltImageText initial=false
 
 # Used by the android_webview to support a horizontal height auto-sizing
 # mode.
 forceZeroLayoutHeight initial=false, invalidate=ViewportDescription
 
 # Touch based text selection and editing on desktop.
 # crbug.com/304873 tracks removal once it's been enabled on all platforms.
 touchEditingEnabled initial=false
 
-# Settings for experimental desktop pinch-zoom support (with semantics
-# optimized for large screens).  Pinch-zoom generally is implemented mainly
-# outside of blink (in the compositor) and doesn't require any settings.
-# These settings are for an experimental modification to how pinch-zoom
-# behaves.  TODO(wjmaclean): link to design document.
-# crbug.com/304869 tracks removal.
-pinchVirtualViewportEnabled initial=false
 useSolidColorScrollbars initial=true
-pinchOverlayScrollbarThickness type=int, initial=0
 
 mainFrameClipsContent initial=true
 
 
 # Presumably used by tests?  Unclear.
 useWideViewport initial=true, invalidate=ViewportDescription
 loadWithOverviewMode initial=true, invalidate=ViewportDescription
 
 
 # Font scale factor for accessibility, applied as part of text autosizing.
@@ skipping 33 matching lines @@
 # has pointerType coarse *and* fine).
 availablePointerTypes type=int, initial=PointerTypeNone, invalidate=MediaQuery
 availableHoverTypes type=int, initial=HoverTypeNone, invalidate=MediaQuery
 
 # These values specify properties of the user's primary pointing device only.
 primaryPointerType type=PointerType, initial=PointerTypeNone, invalidate=MediaQuery
 primaryHoverType type=HoverType, initial=HoverTypeNone, invalidate=MediaQuery
 
 accessibilityEnabled initial=false
 inlineTextBoxAccessibilityEnabled initial=false