Update libchromiumcontent to get its Python scripts
Update libchromiumcontent to get its Python scripts

* vendor/libchromiumcontent 3f6f01c...588f368 (17):
  > Merge pull request #8 from aroben/menu-controller
  > Merge pull request #6 from aroben/shell_dialogs
  > Fix typo in script/create-dist
  > Merge pull request #5 from aroben/python
  > Add libtest_support_chromiumcontent.a
  > Build and distribute libgtest.a
  > Stop trying to compile SQLitePersistentCookieStore separately
  > Update to latest Chromium trunk revision
  > Merge pull request #4 from aroben/atom
  > Actually compile the base/prefs code
  > Export symbols from base/prefs
  > Compile and export SQLitePersistentCookieStore
  > Export webkit/plugins headers
  > Export skia/ext headers
  > Export ui/surface headers, too
  > Export Skia symbols from libchromiumcontent
  > Update to match chrome/trunk

tejaspathak/brightray,bbondy/brightray,tejaspathak/brightray,deepak1556/brightray,hokein/brightray,paulcbetts/brightray,paulcbetts/brightray,lakshmi-srinivas/brightray,brave/brightray,deepak1556/brightray,brave/brightray,atom/brightray,hokein/brightray,lakshmi-srinivas/brightray,lakshmi-srinivas/brightray,atom/brightray,bbondy/brightray