Fix gyp deps for perl scripts in WebCore/scripts/
Fix gyp deps for perl scripts in WebCore/scripts/

Without the .pm dependencies, changes to those files can cause
build failures, as happened in https://codereview.chromium.org/13859002.

Review URL: https://codereview.chromium.org/13839019

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@147951 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs