Check in a script that prints linker-determined unused symbols.
Check in a script that prints linker-determined unused symbols.

This outputs an HTML report of symbols that the linker claimed
were not used.  It includes instructions on how to get the linker
to emit that.

Review URL: http://codereview.chromium.org/3739002

git-svn-id: http://src.chromium.org/svn/trunk/src@62342 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 83182fda18bed667a39049b22a281f398cc43bb3
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