Unreviewed. Fix script to use WEBKIT_SOURCE for VS2010 property sheets instead of WEBKIT_LIBRARIES.

* WTF.vcxproj/work-around-vs-dependency-tracking-bugs.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143997 268f45cc-cd09-0410-ab3c-d52691b4dbfc
[chromium] WebViewImpl::m_client can be null in some unit tests, check it before calling
https://bugs.webkit.org/show_bug.cgi?id=110834

Reviewed by Adrienne Walker.

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::suppressInvalidations):
(WebKit::WebViewImpl::setRootGraphicsLayer):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143998 268f45cc-cd09-0410-ab3c-d52691b4dbfc