Use #if defined(__LP64__) in preference to #if __LP64__. This is a follow-up
to r79069.

BUG=44127, 18323
TEST=64-bit base should all (mostly) build
Review URL: http://codereview.chromium.org/6723016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@79252 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed