[Windows] Fix the build after r163757-r163815

[Csaba Osztrogonác]

http://trac.webkit.org/changeset/163757 broke the Windows build
and then http://trac.webkit.org/changeset/163815 probably fixed
the failure caused by r163757. 

But the build was broken during 58 commits and it seems somebody else 
broke it again (during the build failure) and the build is still broken.

build log:

       WebView.cpp
     1>C:\cygwin\home\buildbot\slave\win-release\build\WebKitBuild\Release\Include\private\wtf/PrintStream.h(277): error C2039: 'dump' : is not a member of 'WebCore::BString'
                 C:\cygwin\home\buildbot\slave\win-release\build\WebKitBuild\Release\Include\WebCore/BString.h(41) : see declaration of 'WebCore::BString'
                 C:\cygwin\home\buildbot\slave\win-release\build\WebKitBuild\Release\Include\private\wtf/PrintStream.h(58) : see reference to function template instantiation 'void WTF::printInternal<T>(WTF::PrintStream &,const T &)' being compiled
                 with
                 [
                     T=WebCore::BString
                 ]
                 C:\cygwin\home\buildbot\slave\win-release\build\WebKitBuild\Release\Include\private\wtf/StringPrintStream.h(106) : see reference to function template instantiation 'void WTF::PrintStream::print<T>(const T &)' being compiled
                 with
                 [
                     T=WebCore::BString
                 ]
                 ..\..\win\WebView.cpp(2768) : see reference to function template instantiation 'WTF::String WTF::toString<WebCore::BString>(const T &)' being compiled
                 with
                 [
                     T=WebCore::BString
                 ]
     1>Done Building Project "C:\cygwin\home\buildbot\slave\win-release\build\Source\WebKit\WebKit.vcxproj\WebKit\WebKit.vcxproj" (Build target(s)) -- FAILED.

Build FAILED.

[Brent Fulgham]

*** This bug has been marked as a duplicate of bug 128601 ***

[Csaba Osztrogonác]

*** This bug has been marked as a duplicate of bug 128607 ***