webkit: pull in gdb tools on Linux
webkit: pull in gdb tools on Linux

We don't normally check out Tools/gdb, so we need to explicitly
list it in DEPS.

Review URL: http://codereview.chromium.org/6627027

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@77164 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser