BUILD FIX (r146208): Export shouldPrintExceptions methods for iOS

Fixes the following build failure:

    Undefined symbols for architecture i386:
      "__ZN7WebCore11PageConsole24setShouldPrintExceptionsEb", referenced from:
            +[WebCoreStatistics setShouldPrintExceptions:] in WebCoreStatistics.o
      "__ZN7WebCore11PageConsole21shouldPrintExceptionsEv", referenced from:
            +[WebCoreStatistics shouldPrintExceptions] in WebCoreStatistics.o
    ld: symbol(s) not found for architecture i386
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

* WebCore.exp.in: Move symbols so they're exported for iOS as
well.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146598 268f45cc-cd09-0410-ab3c-d52691b4dbfc