Make not finding an installed WebKit non-fatal

     Make not finding an installed WebKit non-fatal

         What really matters is that we are able to load WebKit and its
         dependencies, not whether we think we've found an installed WebKit.

         Reviewed by Sam.

         * WebKitInitializer/WebKitInitializer.cpp:
         (getWebViewCLSID): Use new LOG_WARNING macro.
         (getInstalledWebKitDirectory): Ditto.
         (initializeWebKit): Don't die if we didn't find an installed WebKit,
         and use new macros.
         * WebKitInitializer/WebKitInitializer.vcproj: Disabled a warning.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@25763 268f45cc-cd09-0410-ab3c-d52691b4dbfc