roll gyp 1836:1840.

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
 #   gclient runhooks
 # DO NOT CHECK IN CHANGES TO .DEPS.git. It will be automatically updated by
 # a bot when you modify this one.
@@ skipping 114 matching lines @@
   "src/third_party/libc++abi/trunk":
     Var("llvm_git") + "/libcxxabi.git@" + Var("libcxxabi_revision"),
 
   "src/third_party/snappy/src":
     (Var("googlecode_url") % "snappy") + "/trunk@80",
 
   "src/tools/grit":
     (Var("googlecode_url") % "grit-i18n") + "/trunk@147",
 
   "src/tools/gyp":
-    (Var("googlecode_url") % "gyp") + "/trunk@1836",
+    (Var("googlecode_url") % "gyp") + "/trunk@1840",
 
   "src/tools/swarming_client":
     Var("chromium_git") + "/external/swarming.client.git@" +
         Var("swarming_revision"),
 
   "src/v8":
     (Var("googlecode_url") % "v8") + "/trunk@" + Var("v8_revision"),
 
   "src/native_client":
     Var("nacl_trunk") + "/src/native_client@" + Var("nacl_revision"),
@@ skipping 601 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "name": "landmines",
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]