test_runner: Migrate WebTestRunner to our Chromium C++ style.

Changes:
1) Run clang-format through header file.
3) Fix method names to use CamelCase style.
4) Rename file name to web_test_runner.

BUG=331299
TEST=content_unittests, content_shell. No functional changes
[email protected]

Review URL: https://codereview.chromium.org/297273003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272853 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed