remove redundant includes of common.gypi and unused repo (support)

DEPS

 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 
 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
@@ skipping 52 matching lines @@
   "webrtc_revision": "2291",
   "jsoncpp_revision": "248",
   "nss_revision": "138140",
   "rlz_revision": "128",
 }
 
 deps = {
   "src/breakpad/src":
     (Var("googlecode_url") % "google-breakpad") + "/trunk/src@939",
 
-  "src/build/util/support":
-    "/trunk/deps/support@20411",
-
   "src/googleurl":
     (Var("googlecode_url") % "google-url") + "/trunk@175",
 
   "src/seccompsandbox":
     (Var("googlecode_url") % "seccompsandbox") + "/trunk@186",
 
   "src/sdch/open-vcdiff":
     (Var("googlecode_url") % "open-vcdiff") + "/trunk@42",
 
   "src/testing/gtest":
@@ skipping 452 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/util/lastchange.py",
                "-o", "src/build/util/LASTCHANGE"],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]