Update WebKit to r47305 to pick up fix for assertions caused in r47270:
Update WebKit to r47305 to pick up fix for assertions caused in r47270:

ASSERTION FAILED: m_clients.contains(renderer)
(.../src/webkit/../third_party/WebKit/WebCore/css/CSSGradientValue.cpp:109 virtual WebCore::Image* WebCore::CSSGradientValue::image(WebCore::RenderObject*, const WebCore::IntSize&))

while hovering over tab thumbnails on the New Tab page on the Mac in a debug
build
Review URL: http://codereview.chromium.org/172049

git-svn-id: http://src.chromium.org/svn/trunk/src@23546 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c4f5e20e375124f2d511560f6b202a047e92e84a
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser