Revert of Improve readability of power monitoring code and add additional

tools/telemetry/telemetry/internal/platform/power_monitor/__init__.py

Index: tools/telemetry/telemetry/internal/platform/power_monitor/__init__.py
diff --git a/tools/telemetry/telemetry/internal/platform/power_monitor/__init__.py b/tools/telemetry/telemetry/internal/platform/power_monitor/__init__.py
index 4c3cf4532cbe3859ba6d966d185a45b76ef7d041..7a13fa91d2b2de33e6024e89547bafc3ba7c6e15 100644
--- a/tools/telemetry/telemetry/internal/platform/power_monitor/__init__.py
+++ b/tools/telemetry/telemetry/internal/platform/power_monitor/__init__.py
@@ -1,8 +1,6 @@
 # Copyright 2014 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.
-
-import logging
 
 from telemetry.core import exceptions
 
@@ -12,9 +10,6 @@
 
   Provides an interface to register power consumption during a test.
   """
-  def __init__(self):
-    self._monitoring = False
-
   def CanMonitorPower(self):
     """Returns True iff power can be monitored asynchronously via
     StartMonitoringPower() and StopMonitoringPower().
@@ -26,14 +21,6 @@
     application in isolation. False if power measurement is for full system
     energy consumption."""
     return False
-
-  def _CheckStart(self):
-    assert not self._monitoring, "Already monitoring power."
-    self._monitoring = True
-
-  def _CheckStop(self):
-    assert self._monitoring, "Not monitoring power."
-    self._monitoring = False
 
   def StartMonitoringPower(self, browser):
     """Starts monitoring power utilization statistics.