Reviewed by Geoff Garen and Tim Hatcher.

    Reviewed by Geoff Garen and Tim Hatcher.

        - fixed <rdar://problem/5482745> initFromCoder: and initWithPropertyList: functions
          should guard against incorrect types

        * WebView/WebArchive.m:
        (isArrayOfClass): Added helper function.
        (-[WebArchive _initWithPropertyList:]): Tweaked function to remove the need for a
        type cast.
        (-[WebArchive initWithCoder:]): Added type checking for the main resource,
        subresources array, and subframe archives array. Also replaced NS_DURING with @try.
        * WebView/WebPreferences.m: (-[WebPreferences initWithCoder:]): Added type checking
        for the identifier and the values dictionary, including ensuring that it's a mutable
        dictionary.
        * WebView/WebResource.mm:
        (-[WebResource initWithCoder:]): Added type checking for all the fields.
        (-[WebResource _initWithPropertyList:]): Added type checking for the NSURLResponse.

        * WebKit.exp: Removed accidentally exported internal symbol; I checked and it's not
        used anywhere.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@25567 268f45cc-cd09-0410-ab3c-d52691b4dbfc