Roll //build, //native_client, and a few more targets of opportunity.

build/util/lastchange.py

Index: build/util/lastchange.py
diff --git a/build/util/lastchange.py b/build/util/lastchange.py
index d1c33e8eb01170face4ed8e8c5814285106e9beb..1a7f5199d2e5614a0dca90c051c750c52a6e1838 100755
--- a/build/util/lastchange.py
+++ b/build/util/lastchange.py
@@ -115,6 +115,7 @@ def FetchGitRevision(directory):
       for line in reversed(output.splitlines()):
         if line.startswith('Cr-Commit-Position:'):
           pos = line.rsplit()[-1].strip()
+          break
   if not pos:
     return VersionInfo('git', hsh)
   return VersionInfo('git', '%s-%s' % (hsh, pos))