Roll Dartium's buildtools to a version with valid DEPS

tools/deps/dartium.deps/DEPS

 # The file DEPS.chromium from this directory (tools/deps/dartium.deps) is
 # copied into this file, rather than imported, because the new DEPS syntax
 # analyzer does not support the way that we import it.
 # Please keep the code between here and "END OF IMPORTED CHROMIUM DEPS"
 # an exact copy of the modified DEPS.chromium in this directory.
 
 vars = {
   # Start of Dartium vars
 
   "dartium_chromium_commit": "67146b50bbc0dab33006c51b5dde056ee16f0f2b",
@@ skipping 60 matching lines @@
 
   # End of Dartium vars
 
   'angle_revision':
     '4d76061e2be5b8b005afba8e0c145592c3b04527',
   'boringssl_revision':
     '6d49157929abdefb155daf2751dc03fd9eb4240c',
   'buildspec_platforms':
     'chromeos,',
   'buildtools_revision':
-    '14288a03a92856fe1fc296d39e6a25c2d83cd6cf',
+    '3d2e47bf14e4e67816a53e304dea422fa18f9180',
   'chromium_git':
     'https://chromium.googlesource.com',
   'deqp_revision':
     'cc0ded6c77267bbb14d21aac358fc5d9690c07f8',
   'deqp_url':
     'https://android.googlesource.com/platform/external/deqp',
   'freetype_android_revision':
     'a512b0fe7a8d9db0e5aa9c0a4db1e92cb861722d',
   'google_toolbox_for_mac_revision':
     '401878398253074c515c03cb3a3f8bb0cc8da6e9',
@@ skipping 23 matching lines @@
 allowed_hosts = [
   'android.googlesource.com',
   'boringssl.googlesource.com',
   'chromium.googlesource.com',
   'pdfium.googlesource.com'
 ]
 deps = {
   'src/breakpad/src':
     (Var("chromium_git")) + '/breakpad/breakpad/src.git@481608d284106df9400d447e95574799670cabaf',
   'src/buildtools':
-    (Var("chromium_git")) + '/chromium/buildtools.git@14288a03a92856fe1fc296d39e6a25c2d83cd6cf',
+    (Var("chromium_git")) + '/chromium/buildtools.git@3d2e47bf14e4e67816a53e304dea422fa18f9180',
   'src/chrome/test/data/perf/canvas_bench':
     (Var("chromium_git")) + '/chromium/canvas_bench.git@a7b40ea5ae0239517d78845a5fc9b12976bfc732',
   'src/chrome/test/data/perf/frame_rate/content':
     (Var("chromium_git")) + '/chromium/frame_rate/content.git@c10272c88463efeef6bb19c9ec07c42bc8fe22b9',
   'src/media/cdm/api':
     (Var("chromium_git")) + '/chromium/cdm.git@1dea7088184dec2ebe4a8b3800aabb0afbb4b88a',
   'src/native_client':
     (Var("chromium_git")) + '/native_client/src/native_client.git@fb00463cb1ebd46a46c050101f8b6a6c999d5dc1',
   'src/sdch/open-vcdiff':
     (Var("chromium_git")) + '/external/github.com/google/open-vcdiff.git@21d7d0b9c3d0c3ccbdb221c85ae889373f0a2a58',
@@ skipping 808 matching lines @@
   'native_client_sdk',
   'out',
   'sdch',
   'skia',
   'testing',
   'v8',
   'win8'
 ]
 
 # END OF IMPORTED CHROMIUM DEPS