Add WebCore/bridge to the header include paths, so that WebCore's version of npapi.h is used in compiling WebCore rather than the one leaked by  third_party/npapi's "direct_dependent_settings" section.
Add WebCore/bridge to the header include paths, so that WebCore's version of npapi.h is used in compiling WebCore rather than the one leaked by  third_party/npapi's "direct_dependent_settings" section.

BUG=17127
Review URL: http://codereview.chromium.org/160533

git-svn-id: http://src.chromium.org/svn/trunk/src@22315 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f00cbd7832b0c3bb8a4c0624b5283ae6f8f9d71d
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