cros_chrome_sdk.py: Fallback to partial-metadata.json when needed.

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of "src").
 #
@@ skipping 474 matching lines @@
       "@852550b82d6580eb5866fc637ea6aa4aeec67eb5",
 
     # Note that this is different from Android's freetype repo.
     "src/third_party/freetype2/src":
       Var("chromium_git") + "/chromium/src/third_party/freetype2.git" +
       "@d699c2994ecc178c4ed05ac2086061b2034c2178",
 
     # Build tools for targeting ChromeOS.
     "src/third_party/chromite":
       Var("chromiumos_git") + "/chromite.git" +
-      "@63193a4393f6e964bfca992bfb03e40183554f7d",
+      "@b310410e13e34af7d3f3f15be98688b016f2222f",
 
     # Dependency of chromite.git.
     "src/third_party/pyelftools":
       Var("chromiumos_git") + "/third_party/pyelftools.git" +
       "@bdc1d380acd88d4bfaf47265008091483b0d614e",
 
     "src/third_party/undoview":
       "/trunk/deps/third_party/undoview@119694",
 
     "src/third_party/liblouis/src":
@@ skipping 262 matching lines @@
                 "-s", "src/build/linux/bin/eu-strip.sha1",
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "name": "gyp",
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]