Roll android_tools 8301b711:31869996

This picks up:

3186999  Fix for incorrect builtin with clang 3.6

BUG=400849
R=fdegans@chromium.org, navabi@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/479623003

Cr-Commit-Position: refs/heads/master@{#289979}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289979 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -507,7 +507,7 @@ deps_os = {
   "android": {
     "src/third_party/android_tools":
       Var("chromium_git") + "/android_tools.git" +
-      "@8301b711a9ac7de56e9a9ff3dee0b2ebfc9a380f",
+      "@31869996507de16812bb53a3d0aaa15cd6194c16",
 
     "src/third_party/aosp":
       "/trunk/deps/third_party/aosp@148330",