webkitpy: Hide WebKitFinder.path_from_webkit_base().

third_party/WebKit/Tools/Scripts/webkitpy/common/webkit_finder.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/webkit_finder.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/webkit_finder.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/webkit_finder.py
index 7b4a97c2381ea58e2f8e344f7c0f4956695cecc7..1850740eb71bf8b8399639708a59f3eb07a1e220 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/webkit_finder.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/webkit_finder.py
@@ -105,10 +105,9 @@ class WebKitFinder(object):
             self._chromium_base = self._filesystem.dirname(self._filesystem.dirname(self.webkit_base()))
         return self._chromium_base
 
-    # TODO(tkent): Make this private. We should use functions for
-    # sub-directories in order to make the code robust against directory
-    # structure changes.
-    def path_from_webkit_base(self, *comps):
+    # Do not expose this function in order to make the code robust against
+    # directory structure changes.
+    def _path_from_webkit_base(self, *comps):
         return self._filesystem.join(self.webkit_base(), *comps)
 
     def path_from_chromium_base(self, *comps):
@@ -127,13 +126,13 @@ class WebKitFinder(object):
         return self._filesystem.join(self._filesystem.join(self.webkit_base(), 'Tools', 'Scripts'), *comps)
 
     def layout_tests_dir(self):
-        return self.path_from_webkit_base('LayoutTests')
+        return self._path_from_webkit_base('LayoutTests')
 
     def path_from_layout_tests(self, *comps):
         return self._filesystem.join(self.layout_tests_dir(), *comps)
 
     def perf_tests_dir(self):
-        return self.path_from_webkit_base('PerformanceTests')
+        return self._path_from_webkit_base('PerformanceTests')
 
     def layout_test_name(self, file_path):
         """Returns a layout test name, given the path from the repo root.