Revert "telemetry: Add GetRendererProcessFromTab to timeline model."

tools/telemetry/telemetry/core/timeline/model.py

Index: tools/telemetry/telemetry/core/timeline/model.py
diff --git a/tools/telemetry/telemetry/core/timeline/model.py b/tools/telemetry/telemetry/core/timeline/model.py
index f31d44a46fadaff9125319d3794ee059ad5f1677..b73e21225760e78b0271a839f990d5c867955552 100644
--- a/tools/telemetry/telemetry/core/timeline/model.py
+++ b/tools/telemetry/telemetry/core/timeline/model.py
@@ -10,8 +10,6 @@ https://code.google.com/p/trace-viewer/
 from operator import attrgetter
 
 import telemetry.core.timeline.process as tracing_process
-from telemetry.core import web_contents
-from telemetry.core import browser
 
 # Register importers for data
 from telemetry.core.timeline import inspector_importer
@@ -43,7 +41,6 @@ class TimelineModel(object):
     self._frozen = False
     self.import_errors = []
     self.metadata = []
-    self._core_object_to_timeline_container_map = {}
 
     if event_data is not None:
       self.ImportTraces([event_data], shift_world_to_zero=shift_world_to_zero)
@@ -174,18 +171,6 @@ class TimelineModel(object):
 
     return events
 
-  def GetRendererProcessFromTab(self, tab):
-    return self._core_object_to_timeline_container_map[tab]
-
-  def AddCoreObjectToContainerMapping(self, core_object, container):
-    """ Add a mapping from a core object to a timeline container.
-
-    Used for example to map a Tab to its renderer process in the timeline model.
-    """
-    assert(isinstance(core_object, web_contents.WebContents) or
-           isinstance(core_object, browser.Browser))
-    self._core_object_to_timeline_container_map[core_object] = container
-
   def _CreateImporter(self, event_data):
     for importer_class in _IMPORTERS:
       if importer_class.CanImport(event_data):