Update libchromiumcontent for better Chrome 35 support

* vendor/libchromiumcontent ded3c0a...331dbed (2):
  > Merge pull request #48 from brightray/chrome35-brightray
  > Merge pull request #49 from brightray/linux-fix
Pull in generated headers from libchromiumcontent

ui/views/view.h now includes ui/accessibility/ax_enums.h, which is a generated
header.
Link against chromiumviews

This is needed for InspectableWebContentsViewWin.
Set up a native screen on Windows

This is needed to prevent a crash inside aura::WindowTreeHost::InitCompositor.
Silence unused variable warning on Windows