telemetry: Add GetRendererProcessFromTab to timeline model.

tools/telemetry/telemetry/core/backends/chrome/trace_result.py

Index: tools/telemetry/telemetry/core/backends/chrome/trace_result.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/trace_result.py b/tools/telemetry/telemetry/core/backends/chrome/trace_result.py
deleted file mode 100644
index bcbcc3a26707671c4351a29c05a16bb8ce95e12e..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/core/backends/chrome/trace_result.py
+++ /dev/null
@@ -1,16 +0,0 @@
-# Copyright 2013 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-class TraceResult(object):
-  def __init__(self, impl):
-    self._impl = impl
-
-  def Serialize(self, f):
-    """Serializes the trace result to a file-like object"""
-    return self._impl.Serialize(f)
-
-  def AsTimelineModel(self):
-    """Parses the trace result into a timeline model for in-memory
-    manipulation."""
-    return self._impl.AsTimelineModel()