Get rid of [Callback] extended attribute for parameters in IDL files

Source/bindings/scripts/IDLAttributes.txt

 #
 # This file describes all IDL attributes.
 # If any IDL file uses an IDL attribute not listed below, the WebKit build will fail.
 # If you want to add a new IDL attribute, you need to
 #     (1) add the IDL attribute to this file
 #     (2) add the explanation to the WebKit IDL document (https://trac.webkit.org/wiki/WebKitIDL)
 #     (3) add test cases to run-bindings-tests
 #
 # The syntax of this file is as follows:
 #     - You can write one IDL attribute per one line.
 #     - "ATTR" means that the IDL attribute ATTR does not take any argument; i.e. [ATTR].
 #     - "ATTR=X" means that the IDL attribute ATTR always takes one argument X; i.e. [ATTR=X].
 #     - "ATTR=X|Y|Z" means that the IDL attribute ATTR takes one or more arguments
 #       and the arguments are X, Y or Z; e.g. [ATTR=X], [ATTR=Y], [ATTR=X|Z], [ATTR=X|Y|Z].
 #     - "ATTR=|X|Y|Z" means that the IDL attribute ATTR can take arguments
 #       and the arguments are X, Y or Z; e.g. [ATTR], [ATTR=X], [ATTR=Y], [ATTR=X|Z], [ATTR=X|Y|Z].
 #     - "ATTR=*" means that the IDL attribute ATTR can take arbitrary arguments;
 #       e.g. [ATTR=INDEXED_DATABASE], [ATTR=deleteFunction].
 #
 
 ActiveDOMObject
 ActivityLog=Access|Setter|Getter|AccessForIsolatedWorlds|SetterForIsolatedWorlds|GetterForIsolatedWorlds
 CachedAttribute
 CacheAttributeForGC
 CallWith=ScriptExecutionContext|ScriptState|ScriptArguments
-Callback
 CheckSecurity
 CheckSecurityForNode
 Clamp
 Conditional=*
 Constructor
 RaisesException
 ConstructorTemplate=Event|TypedArray
 Custom
 CustomCall
 CustomConstructor
@@ skipping 48 matching lines @@
 SkipVTableValidation
 StrictTypeChecking
 SuppressToJSObject
 TreatNullAs=NullString
 TreatReturnedNullStringAs=Null|Undefined
 TreatUndefinedAs=NullString
 TypedArray=*
 URL
 Unforgeable
 WrapAsFunction