Re-applying build/common.gypi patch from http://codereview.chromium.org/195078
Re-applying build/common.gypi patch from http://codereview.chromium.org/195078

The previous patch was reverted until buildbot master was restarted.

After the restart, GYP_DEFINES contains "release_valgrind_build=1"
http://build.chromium.org/buildbot/waterfall/builders/Chromium Linux Builder (valgrind)/builds/2/steps/gclient/logs/stdio
Review URL: http://codereview.chromium.org/196140

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@26564 0039d316-1c4b-4281-b951-d872f2087c98

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