Becuase base/strings/string_split.h defines:
commit1af96aa7b7d721bad77b818166892fd413716e98
authorlimasdf <limasdf@gmail.com>
Mon, 15 Sep 2014 16:08:18 +0000 (15 09:08 -0700)
committerCommit bot <commit-bot@chromium.org>
Mon, 15 Sep 2014 16:13:32 +0000 (15 16:13 +0000)
treed4f0d606b1a5e30fa12d1423e297f725bc2dbe9f
parent2dbfd72d2ea1abdcf79ca012686251cb9d112858
Becuase base/strings/string_split.h defines:
typedef std::vector<std::pair<std::string, std::string> > StringPairs;
And use iterator to iterate stl::vector element.

BUG=412250

Review URL: https://codereview.chromium.org/545193008

Cr-Commit-Position: refs/heads/master@{#294832}
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