DevTools: use ScriptDebugServer instead of v8 debugging protocol

Review URL: http://codereview.chromium.org/2458005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@49770 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

features_override.gypi

@@ -44,6 +44,7 @@
       'ENABLE_VIDEO=1',
       'ENABLE_WEB_SOCKETS=1',
       'ENABLE_WORKERS=1',
+      'ENABLE_V8_SCRIPT_DEBUG_SERVER=1',
     ],
     # We have to nest variables inside variables so that they can be overridden
     # through GYP_DEFINES.