add third_party/drmemory to .gitignore and remove valgrind.tmp since obsolete
add third_party/drmemory to .gitignore and remove valgrind.tmp since obsolete

Review URL: http://codereview.chromium.org/6283013

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@72540 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