Roll DEPS for gtest library.

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 56 matching lines @@
 }
 
 deps = {
   "src/breakpad/src":
     (Var("googlecode_url") % "google-breakpad") + "/trunk/src@1271",
 
   "src/sdch/open-vcdiff":
     (Var("googlecode_url") % "open-vcdiff") + "/trunk@42",
 
   "src/testing/gtest":
-    (Var("googlecode_url") % "googletest") + "/trunk@643",
+    (Var("googlecode_url") % "googletest") + "/trunk@677",
 
   "src/testing/gmock":
     (Var("googlecode_url") % "googlemock") + "/trunk@410",
 
   "src/third_party/angle":
     Var("chromium_git") +
     "/angle/angle.git@e1590b895ba9289e91271c901dd6ee46db1ed053",
 
   "src/third_party/trace-viewer":
     (Var("googlecode_url") % "trace-viewer") + "/trunk@1091",
@@ skipping 671 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"],
   },
 ]