Fix for rebaseline-cl --only-changed-tests: use hard-coded constant layout test dir.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py
index 03267c4e376e540782b4d1f51e53c097fa9884ac..9bd8e5bbfd340eb988d3d1234432c614e357af81 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py
@@ -158,8 +158,11 @@ class RebaselineCL(AbstractParallelRebaselineCommand):
         builds_to_tests = self._builds_to_tests(issue_number)
         if only_changed_tests:
             files_in_cl = self.rietveld.changed_files(issue_number)
-            finder = WebKitFinder(self._tool.filesystem)
-            tests_in_cl = [finder.layout_test_name(f) for f in files_in_cl]
+            # Note, in the changed files list from Rietveld, paths always
+            # use / as the separator, and they're always relative to repo root.
+            # TODO(qyearsley): Do this without using a hard-coded constant.
+            test_base = 'third_party/WebKit/LayoutTests/'
+            tests_in_cl = [f[len(test_base):] for f in files_in_cl if f.startswith(test_base)]
         result = {}
         for build, tests in builds_to_tests.iteritems():
             for test in tests: