Move LayoutTests to src/third_party/WebKit
Move LayoutTests to src/third_party/WebKit

Moving LayoutTests to third_party/WebKit directory so people won't confuse about it. Another patch that allows run_webkit_tests to support both directories has been committed, for details, see http://codereview.chromium.org/146112.

BUG=8765
TEST=LayoutTests directory removed and run_wekkit_tests works


Review URL: http://codereview.chromium.org/155115

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@20509 0039d316-1c4b-4281-b951-d872f2087c98

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