Returns a bool for JSONValueConverter::Convert()

As I see a real use scenario in chrome/browser/chromeos/gdata/
gdata_parser.cc, I realized that sometimes structural validity
matters.

It also introduce string16 whose code is almost equivalent to
std::string.

BUG=none
TEST=passed


Review URL: http://codereview.chromium.org/8952029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@116473 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 261c877ec8b445c6208063cb7d9814c52853dd81
2 files changed
tree: 00c14d58e5cf080c1becec634d8e48b1cab621c0
  1. base/
  2. build/
  3. dbus/
  4. ipc/
  5. testing/
  6. third_party/