Revert of Bump luci/gae.

DEPS

 vars = {
   # npm_modules.git is special: we can't check it out on Windows because paths
   # there are too long for Windows. Instead we use 'deps_os' gclient feature to
   # checkout it out only on Linux and Mac.
   "npm_modules_revision": "029f11ae7e3189fd57f7764b4bb43d0900e16c92",
 }
 
 deps = {
   "build":
     "https://chromium.googlesource.com/chromium/tools/build.git",
@@ skipping 10 matching lines @@
   "infra/recipes-py":
    ("https://chromium.googlesource.com/external/github.com/luci/recipes-py"
      "@origin/master"),
 
   "infra/go/src/github.com/luci/luci-go":
     ("https://chromium.googlesource.com/external/github.com/luci/luci-go"
      "@b64e79dd4a3f2a4b38d06cf1d98a212d25be1c2b"),
 
   "infra/go/src/github.com/luci/gae":
     ("https://chromium.googlesource.com/external/github.com/luci/gae"
-     "@0a4fa8065e6843ebbbca94561b3df42447150ec4"),
+     "@ecb855a03c1c253984cab51cace564d204d349cd"),
 
   # Appengine third_party DEPS
   "infra/appengine/third_party/bootstrap":
     ("https://chromium.googlesource.com/external/github.com/twbs/bootstrap.git"
      "@b4895a0d6dc493f17fe9092db4debe44182d42ac"),
 
   "infra/appengine/third_party/cloudstorage":
     ("https://chromium.googlesource.com/external/github.com/"
      "GoogleCloudPlatform/appengine-gcs-client.git"
      "@76162a98044f2a481e2ef34d32b7e8196e534b78"),
@@ skipping 108 matching lines @@
   },
   {
     "pattern": ".",
     "action": [
       "python", "-u", "./infra/bootstrap/install_cipd_packages.py", "-v",
     ],
   },
 ]
 
 recursedeps = ['build']