Remove unused V8 integration code in Sky

sky/engine/bindings/IDLExtendedAttributes.txt

-#
-# This file describes all Blink IDL extended attributes and allowed values.
-# If any IDL file uses an extended attribute or values not listed below, the
-# build will fail.
-# If you would like to add a new extended attribute or value, please:
-#     (1) add the extended attribute or value to this file
-#     (2) add an explanation to the Blink IDL extended attributes document:
-#         http://www.chromium.org/blink/webidl/blink-idl-extended-attributes
-#     (3) add appropriate test cases to run-bindings-tests
-#
-# The syntax of this file is as follows:
-#     - One extended attribute per one line: Name and (optionally) Values.
-#     - "Attr" means that the Attr does not take a value, i.e. [Attr].
-#     - "Attr=X" means that Attr takes a required value, which must be X;
-#       i.e. [Attr=X].
-#     - "Attr=X|Y|Z" means that Attr takes a required value, and the valid
-#       values are X, Y, and Z, and combinations thereof;
-#       e.g. [Attr=X], [Attr=Y], [Attr=X|Z].
-#       The separator must be | or &, so [Attr=X&Z] is also valid; the
-#       separator makes a difference for Conditional, but otherwise is simply
-#       a style convention.
-#     - "Attr=|X|Y|Z" means that Attr takes an optional value, whose valid
-#       values (if present) are X, Y, and Z, and combinations thereof; e.g.
-#       [Attr], [Attr=X], [Attr=Y], [Attr=X|Z], [Attr=X|Y|Z], [Attr=X&Z].
-#       Note that including an empty value in the list, as in [Attr=X||Y],
-#       is NOT valid: the value is optional, but empty values are not allowed.
-#     - "Attr=*" means that Attr takes a required value, which can be
-#       arbitrary, and combinations thereof, e.g. [Attr=IndexedDB],
-#       [Attr=DeleteFunction], [Attr=X|Y].
-#     - "Attr=|*" means that Attr takes an optional value, which can be
-#       arbitrary, e.g. [Attr], [Attr=X].
-#     - "Attr=X|*" means that Attr takes an required value, which can be
-#       arbitrary, but that "X" is standard, e.g. [Attr=X], [Attr=Foo].
-#
-
-ActiveDOMObject
-CachedAttribute=*
-CallWith=ExecutionContext|ScriptState|ScriptArguments|ActiveWindow|FirstWindow|ThisValue
-CheckSecurity=Frame|Node|Window
-Clamp
-Conditional=*
-Constructor
-# FIXME: remove [ConstructorCallWith=Document], as can instead use
-# [ConstructorCallWith=ExecutionContext] + toDocument(executionContext)
-ConstructorCallWith=ExecutionContext|Document
-Custom=|Getter|Setter|LegacyCallAsFunction|ToV8|VisitDOMWrapper|Wrap|PropertyGetter|PropertyEnumerator|PropertyQuery
-CustomConstructor
-CustomElementCallbacks
-Default=Undefined
-DependentLifetime
-DeprecateAs=*
-DoNotCheckConstants
-DoNotCheckSecurity=|Setter
-DoNotCheckSignature
-EnforceRange
-EventConstructor
-ExposeJSAccessors
-Exposed=*
-Global=|*
-Immutable
-ImplementedAs=*
-InitializedByEventConstructor
-Iterable
-LegacyTreatAsPartialInterface
-LogPreviousValue
-MeasureAs=*
-NamedConstructor=*
-NoImplHeader
-NoInterfaceObject
-NotEnumerable
-NotScriptWrappable
-OverrideBuiltins
-PartialInterfaceImplementedAs=*
-PerWorldBindings
-PrimaryGlobal=|*
-PutForwards=*
-RaisesException=|Getter|Setter|Constructor
-Reflect=|*
-ReflectEmpty=*
-ReflectInvalid=*
-ReflectMissing=*
-ReflectOnly=*
-Replaceable
-# Valid values for [RuntimeEnabled] are the Runtime Enabled Features, listed in
-# engine/core/page/RuntimeEnabledFeatures.in
-RuntimeEnabled=*
-SetWrapperReferenceFrom=*
-SetWrapperReferenceTo=*
-SetterCallWith=ExecutionContext|ScriptArguments|ActiveWindow|FirstWindow
-SpecialWrapFor=*
-TreatNullAs=NullString|EmptyString
-TreatReturnedNullStringAs=Null|Undefined
-TreatUndefinedAs=NullString
-TypeChecking=Interface|Unrestricted
-URL
-Unforgeable