[Telemetry] Remove Page.TransferToPageSet method.

This method is never used. It was introduced as a way to conveniently share pages among page sets. The implementation
is not correct as archive_data_file is defined in page_set.

In the future, sharing pages among pageset should be simple
when we can remove the page's dependence on pageset (https://code.google.com/p/chromium/issues/detail?id=466836)

Review URL: https://codereview.chromium.org/1033493003

Cr-Commit-Position: refs/heads/master@{#322661}

tools/telemetry/telemetry/page/__init__.py

@@ -76,26 +76,6 @@ class Page(user_story.UserStory):
       if startup_url_scheme == 'file':
         raise ValueError('startup_url with local file scheme is not supported')
 
-  def TransferToPageSet(self, another_page_set):
-    """ Transfer this page to another page set.
-    Args:
-      another_page_set: an instance of telemetry.page.PageSet to transfer this
-          page to.
-    Note:
-      This method removes this page instance from the pages list of its current
-      page_set, so one should be careful not to iterate through the list of
-      pages of a page_set and calling this method.
-      For example, the below loop is erroneous:
-        for p in page_set_A.pages:
-          p.TransferToPageSet(page_set_B.pages)
-    """
-    assert self._page_set
-    if another_page_set is self._page_set:
-      return
-    self._page_set.pages.remove(self)
-    self._page_set = another_page_set
-    self._page_set.AddUserStory(self)
-
   def RunNavigateSteps(self, action_runner):
     url = self.file_path_url_with_scheme if self.is_file else self.url
     action_runner.Navigate(

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)

tools/telemetry/telemetry/page/page_unittest.py

@@ -147,22 +147,6 @@ class TestPage(unittest.TestCase):
           'name': 'Example'
         }, named_dict)
 
-  def testTransferToPageSet(self):
-    page_set_a = page_set.PageSet()
-    page_set_b = page_set.PageSet()
-    page_foo = page.Page('http://foo.com', page_set_a)
-    page_bar = page.Page('http://bar.com', page_set_a)
-    page_baz = page.Page('http://baz.com', page_set_a)
-
-    page_set_a.AddUserStory(page_foo)
-    page_set_a.AddUserStory(page_bar)
-    page_set_a.AddUserStory(page_baz)
-
-    page_bar.TransferToPageSet(page_set_b)
-    self.assertEqual([page_foo, page_baz], page_set_a.pages)
-    self.assertEqual([page_bar], page_set_b.pages)
-    self.assertIs(page_set_b, page_bar.page_set)
-
   def testIsLocal(self):
     p = page.Page('file://foo.html')
     self.assertTrue(p.is_local)