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The "implemented_in" key format like this:
  [implemented_in="path/to/implemented_file"]
  namespace Foo {...};

BUG=313579
TEST=pass idl_schema_test

Review URL: https://codereview.chromium.org/56543003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233442 0039d316-1c4b-4281-b951-d872f2087c98