[Telemetry] Remove Page.TransferToPageSet method.

tools/telemetry/telemetry/page/page_set_unittest.py

Index: tools/telemetry/telemetry/page/page_set_unittest.py
diff --git a/tools/telemetry/telemetry/page/page_set_unittest.py b/tools/telemetry/telemetry/page/page_set_unittest.py
index 335d75b819a9f57463032c5fd9de2f2d66fe2e76..0e764a2e5327de0e3e052d61e3ea622d426476a3 100644
--- a/tools/telemetry/telemetry/page/page_set_unittest.py
+++ b/tools/telemetry/telemetry/page/page_set_unittest.py
@@ -43,24 +43,3 @@ class TestPageSet(unittest.TestCase):
                                               real_absolute_dir]))
     finally:
       os.rmdir(directory_path)
-
-  def testFormingPageSetFromSubPageSet(self):
-    page_set_a = page_set.PageSet()
-    pages = [
-        page.Page('http://foo.com', page_set_a),
-        page.Page('http://bar.com', page_set_a),
-        ]
-    for p in pages:
-      page_set_a.AddUserStory(p)
-
-    # Form page_set_b from sub page_set_a.
-    page_set_b = page_set.PageSet()
-    for p in pages:
-      p.TransferToPageSet(page_set_b)
-    page_set_b.AddUserStory(page.Page('http://baz.com', page_set_b))
-    self.assertEqual(0, len(page_set_a.pages))
-    self.assertEqual(
-        set(['http://foo.com', 'http://bar.com', 'http://baz.com']),
-        set(p.url for p in page_set_b.pages))
-    for p in page_set_b.pages:
-      self.assertIs(page_set_b, p.page_set)