Update Android build to API level 17 and SDK Tools version 21

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 529 matching lines @@
       "@5e8f6d9db5c2abfb91d91f751184f25bb5cd0900",
 
     # For Linux and Chromium OS.
     "src/third_party/cros_system_api":
       Var("chromiumos_git") + "/platform/system_api.git" +
       "@ab0914ff00db279c5a3599bdf6a19ba1e3c44634",
   },
   "android": {
     "src/third_party/android_tools":
       Var("chromium_git") + "/android_tools.git" +
-      "@704c8ddee726aabe0e78bb88545972d2cf298190",
+      "@fd3cfb745f17fde04c96f28c7ae748720604dd8b",
 
     "src/third_party/aosp":
       "/trunk/deps/third_party/aosp@148330",
 
     "src/third_party/apache-mime4j":
       "/trunk/deps/third_party/apache-mime4j@170888",
 
     "src/third_party/findbugs":
       "/trunk/deps/third_party/findbugs@163586",
 
@@ skipping 101 matching lines @@
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]