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GoogleTest (gtest) and GoogleMock (gmock) are now hosted into the same
googletest repository. In order to cope with this, the googletest
repository is now sourced at third_party/googletest.

The file/directory layout of Google Test is not yet considered stable.
To minimize disruption while Google Test stabilizes, Chromium code will
be insulated from third_party/googletest.

* testing/gtest/include/gtest/ and testing/gmock/include/gmock have
  been populated with headers that forward into the appropriate locations of
  third_party/googletest

* testing/BUILD.gn has been populated with the targets
  //testing/gtest(:gtest_main) and //testing/gmock(:gmock_main), which
  depend on the appropriate //third_party/googletest targets.

All Chromium code should keep depending on the targets and headers
in testing/{gtest,gmock} for now.

BUG=630705
TBR=rkc

Review-Url: https://codereview.chromium.org/2779193002
Cr-Commit-Position: refs/heads/master@{#467833}