Revert 73304 (broke clang/linux) - Use early expansion for debug_optimize and release_optimize
Revert 73304 (broke clang/linux) - Use early expansion for debug_optimize and release_optimize

This fixes a bug when these flags are not overriden from ~/.gyp/include.gypi
which is the way they should be set for Valgrind builds
(see http://dev.chromium.org/developers/how-tos/using-valgrind )

BUG=70107
TEST=gclient runhooks --force && grep "\-O" base/base.target.mk
Review URL: http://codereview.chromium.org/6267004

TBR=timurrrr@chromium.org
Review URL: http://codereview.chromium.org/6334026

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@73329 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