REGRESSION(r93902): Can't open external links on gmail
https://bugs.webkit.org/show_bug.cgi?id=67234
<rdar://problem/10053636>

Reviewed by Alexey Proskuryakov.

* Shared/cf/ArgumentCodersCF.cpp:
(CoreIPC::decode):
If we encounter an empty URL string, create an empty url by using NSURL, just
like we do in WebCore when converting an empty KURL to an NSURL.

* WebKit2.xcodeproj/project.pbxproj:
Compile ArgumentCodersCF.cpp as Objective-C++ for now.


git-svn-id: svn://svn.chromium.org/blink/trunk@94246 bbb929c8-8fbe-4397-9dbb-9b2b20218538
static CFType typeFromCFTypeRef(CFTypeRef type)
{
    ASSERT(type);

    if (type == tokenNullTypeRef())
        return Null;

    CFTypeID typeID = CFGetTypeID(type);
    if (typeID == CFArrayGetTypeID())
        return CFArray;
    if (typeID == CFBooleanGetTypeID())
        return CFBoolean;
    if (typeID == CFDataGetTypeID())
        return CFData;
    if (typeID == CFDateGetTypeID())
        return CFDate;
    if (typeID == CFDictionaryGetTypeID())
        return CFDictionary;
    if (typeID == CFNullGetTypeID())
        return CFNull;
    if (typeID == CFNumberGetTypeID())
        return CFNumber;
    if (typeID == CFStringGetTypeID())
        return CFString;
    if (typeID == CFURLGetTypeID())
        return CFURL;
#if PLATFORM(MAC)
    if (typeID == SecCertificateGetTypeID())
        return SecCertificate;
    if (typeID == SecKeychainItemGetTypeID())
        return SecKeychainItem;
#endif

    ASSERT_NOT_REACHED();
    return Unknown;
}

static CFType typeFromCFTypeRef(CFTypeRef type)
{
    ASSERT(type);

    if (type == tokenNullTypeRef())
        return Null;

    CFTypeID typeID = CFGetTypeID(type);
    if (typeID == CFArrayGetTypeID())
        return CFArray;
    if (typeID == CFBooleanGetTypeID())
        return CFBoolean;
    if (typeID == CFDataGetTypeID())
        return CFData;
    if (typeID == CFDateGetTypeID())
        return CFDate;
    if (typeID == CFDictionaryGetTypeID())
        return CFDictionary;
    if (typeID == CFNullGetTypeID())
        return CFNull;
    if (typeID == CFNumberGetTypeID())
        return CFNumber;
    if (typeID == CFStringGetTypeID())
        return CFString;
    if (typeID == CFURLGetTypeID())
        return CFURL;
#if PLATFORM(MAC)
    if (typeID == SecCertificateGetTypeID())
        return SecCertificate;
    if (typeID == SecKeychainItemGetTypeID())
        return SecKeychainItem;
#endif

    ASSERT_NOT_REACHED();
    return Unknown;
}
