Remove webkit dependency in grit_rule.

We needed to set a grit define to build the blink_resources target
properly. We were doing this via a global define that affected all
targets, but now we're doing this with a local define instead.

R=rtoy@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1338193003

Cr-Commit-Position: refs/heads/master@{#348812}
1 file changed