Add WebKit.gyp:generate_devtools_zip to the All target.

This is needed so the clobber builders will generate the devtools zip
that gets archived by the bots.

BUG=113948


Review URL: http://codereview.chromium.org/9395025

git-svn-id: http://src.chromium.org/svn/trunk/src/build@121992 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -49,6 +49,7 @@
         '../third_party/ots/ots.gyp:*',
         '../third_party/sqlite/sqlite.gyp:*',
         '../third_party/WebKit/Source/WebKit/chromium/All.gyp:*',
+        '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:generate_devtools_zip',
         '../third_party/zlib/zlib.gyp:*',
         '../v8/tools/gyp/v8.gyp:*',
         '../webkit/support/webkit_support.gyp:*',