Remove meta viewport and @viewport CSS rules.

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?
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 # Some apps could have a default video poster if it is not set.
 defaultVideoPosterURL type=String
 
 smartInsertDeleteEnabled initial=defaultSmartInsertDeleteEnabled
 
 selectionIncludesAltImageText initial=false
 
 # Used by the android_webview to support a horizontal height auto-sizing
 # mode.
-forceZeroLayoutHeight initial=false, invalidate=ViewportDescription
+forceZeroLayoutHeight initial=false
 
 # Touch based text selection and editing on desktop.
 # crbug.com/304873 tracks removal once it's been enabled on all platforms.
 touchEditingEnabled initial=false
 
 useSolidColorScrollbars initial=true
 
 mainFrameClipsContent initial=true
 
-
 # Presumably used by tests?  Unclear.
-useWideViewport initial=true, invalidate=ViewportDescription
-loadWithOverviewMode initial=true, invalidate=ViewportDescription
-
+useWideViewport initial=true
+loadWithOverviewMode initial=true
 
 # Font scale factor for accessibility, applied as part of text autosizing.
 accessibilityFontScaleFactor type=double, initial=1.0
 
-
 # Only set by Layout Tests.
 mediaTypeOverride type=String, initial="screen", invalidate=MediaType
 
 # loadsImagesAutomatically only suppresses the network load of
 # the image URL. A cached image will still be rendered if requested.
 loadsImagesAutomatically initial=false, invalidate=ImageLoading
 imagesEnabled initial=true, invalidate=ImageLoading
 
-viewportEnabled initial=false, invalidate=ViewportDescription
-viewportMetaEnabled initial=false
-
 # Compensates for poor text legibility on mobile devices. This value is
 # multiplied by the font scale factor when performing text autosizing of
 # websites that do not set an explicit viewport description.
 deviceScaleAdjustment type=double, initial=1.0
 
 # This value indicates the maximum number of bytes a document is allowed
 # to transmit in Beacons (via navigator.sendBeacon()) -- Beacons are
 # intended to be smaller payloads transmitted as a page is unloading, not
 # a general (one-way) network transmission API.
 # The spec ( https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/Beacon/Overview.html )
 # does not proscribe an upper limit, but allows for it -- the underlying
 # API will return 'false' in that case.
 maxBeaconTransmission type=int, initial=65536
 
 # V8 supports different types of caching. Used by V8 bindings.
 v8CacheOptions type=V8CacheOptions, initial=V8CacheOptionsOff
 
 # These values are bit fields for the properties of available pointing devices
 # and may take on multiple values (e.g. laptop with touchpad and touchscreen
 # 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