Created multi-process-friendly PowerMonitor interface.

base/power_monitor/power_monitor_posix.cc

Index: base/power_monitor/power_monitor_posix.cc
diff --git a/base/power_monitor/power_monitor_posix.cc b/base/power_monitor/power_monitor_posix.cc
index affebea82fd42e00dadcf22f1106c8e4e769065b..0aa390b70f6d98fe0368e731476c6baaa8c0a530 100644
--- a/base/power_monitor/power_monitor_posix.cc
+++ b/base/power_monitor/power_monitor_posix.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/power_monitor/power_monitor.h"
+#include "base/power_monitor/power_monitor_device_source.h"
 
 namespace base {
 
-bool PowerMonitor::IsBatteryPower() {
+bool PowerMonitorDeviceSource::IsBatteryPower() {
   NOTIMPLEMENTED();
   return false;
 }