Remove a bunch of unused or never-set settings.

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?
 # - Is the default value appropriate for other platforms or ports which may
 #   not be aware of your setting?
 # - Can your setting result in behavior differences observable to web
 #   developers?
 # - Should this setting ideally be removed in the future?  If so please file
 #   a bug and reference it in the comments for your setting.
 #
 # One reason to add a Setting is to manage the risk associated with adding a
 # new feature.  For example, we may choose to ship a new UI behavior or
 # performance optimization to ChromeOS users first (in order to gather feedback
 # and metrics on its use from the wild) before attempting to ship it to
 # Windows.
 #
 # FIXME: Add support for global settings.
 # FIXME: Add support for custom getters/setters.
 
 defaultTextEncodingName type=String
 
-# Sets the magnification value for validation message timer.  If the
-# magnification value is N, a validation message disappears automatically after
-# <message length> * N / 1000 seconds.  If N is equal to or less than 0, a
-# validation message doesn't disappears automaticaly.
-validationMessageTimerMagnification type=int, initial=50
-
 # Number of pixels below which 2D canvas is rendered in software
 # even if hardware acceleration is enabled.
 # Hardware acceleration is useful for large canvases where it can avoid the
 # pixel bandwidth between the CPU and GPU. But GPU acceleration comes at
 # a price - extra back-buffer and texture copy. Small canvases are also
 # widely used for stylized fonts. Anti-aliasing text in hardware at that
 # scale is generally slower. So below a certain size it is better to
 # draw canvas in software.
 minimumAccelerated2dCanvasSize type=int, initial=257*256
 
-minimumFontSize type=int, initial=0, invalidate=Style
-minimumLogicalFontSize type=int, initial=0, invalidate=Style
 defaultFontSize type=int, initial=0, invalidate=Style
 defaultFixedFontSize type=int, initial=0, invalidate=Style
 
-caretBrowsingEnabled initial=false
-localStorageEnabled initial=false
-allowUniversalAccessFromFileURLs initial=true
-allowFileAccessFromFileURLs initial=true
 javaScriptCanAccessClipboard initial=false
 shouldClearDocumentBackground initial=true
 
 textAreasAreResizable initial=false, invalidate=Style
 
-shrinksStandaloneImagesToFit initial=true
-
 deferredFiltersEnabled initial=true
 
 containerCullingEnabled initial=false
 
 # FIXME: This should really be disabled by default as it makes platforms that
 # don't support the feature download files they can't use by.
 # Leaving enabled for now to not change existing behavior.
 downloadableBinaryFontsEnabled initial=true
 
-treatIPAddressAsDomain initial=false
-
 preferCompositingToLCDTextEnabled initial=false, invalidate=AcceleratedCompositing
 
 # 3D canvas (WebGL) support.
 webGLEnabled initial=false
 
 webGLErrorsToConsoleEnabled initial=true
 accelerated2dCanvasEnabled initial=false
 antialiased2dCanvasEnabled initial=true
 accelerated2dCanvasMSAASampleCount type=int, initial=0
 
 asynchronousSpellCheckingEnabled initial=false
 
-hyperlinkAuditingEnabled initial=false
-allowDisplayOfInsecureContent initial=true
-allowRunningOfInsecureContent initial=true
-# FIXME: Remove this temporary flag. See crbug.com/366483 for the target
-# milestone.
-allowConnectingInsecureWebSocket initial=false
 mediaPlaybackRequiresUserGesture initial=false
 
 scrollAnimatorEnabled initial=true
 
 # Used in layout tests for gesture tap highlights. Makes the highlights square
 # (rather than rounded) to make it possible to reftest the results.
 mockGestureTapHighlightsEnabled initial=false
 
 shouldRespectImageOrientation initial=false
 
@@ skipping 11 matching lines @@
 # From Pointer Events spec:
 #   http://www.w3.org/TR/pointerevents/#widl-Navigator-maxTouchPoints
 maxTouchPoints type=int, initial=0
 
 # Whether touch gestures should be "fuzzed" to nearest touch targets.
 # It's expected that this is enabled everywhere by default, but it may be
 # disabled for testing purposes as the algorithm is not yet perfect.
 # crbug.com/304895 tracks removal once we're satisfied with the algorithm.
 touchAdjustmentEnabled initial=true
 
-navigateOnDragDrop initial=true
 DOMPasteAllowed initial=false
 
-allowCustomScrollbarInMainFrame initial=true
-webSecurityEnabled initial=true
-
-# This setting adds a means to enable/disable touch initiated drag & drop. If
-# enabled, the user can initiate drag using long press.
-# crbug.com/304894 tracks removal once it's been enabled on all platforms.
-touchDragDropEnabled initial=false
-
 unifiedTextCheckerEnabled initial=defaultUnifiedTextCheckerEnabled
 
 # 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
 
 # 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
 
-
-# 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