SystemMonitor refactoring: move power state monitor into a separate class called PowerMonitor

base/power_monitor/power_monitor_android.h

Index: base/power_monitor/power_monitor_android.h
diff --git a/base/android/important_file_writer_android.h b/base/power_monitor/power_monitor_android.h
similarity index 43%
copy from base/android/important_file_writer_android.h
copy to base/power_monitor/power_monitor_android.h
index 20956babcea94fbd33762f0d7eaa5fed15a05c45..7f4316488fbec6e9b53b04f463cacfa38372f842 100644
--- a/base/android/important_file_writer_android.h
+++ b/base/power_monitor/power_monitor_android.h
@@ -2,17 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NATIVE_FRAMEWORK_CHROME_IMPORTANT_FILE_WRITE_ANDROID_H_
-#define NATIVE_FRAMEWORK_CHROME_IMPORTANT_FILE_WRITE_ANDROID_H_
+#ifndef BASE_POWER_MONITOR_POWER_MONITOR_ANDROID_H_
+#define BASE_POWER_MONITOR_POWER_MONITOR_ANDROID_H_
 
 #include <jni.h>
 
 namespace base {
-namespace android {
 
-bool RegisterImportantFileWriterAndroid(JNIEnv* env);
+// Registers the JNI bindings for PowerMonitor.
+bool RegisterPowerMonitor(JNIEnv* env);
 
-}  // namespace android
 }  // namespace base
 
-#endif  // NATIVE_FRAMEWORK_CHROME_IMPORTANT_FILE_WRITE_ANDROID_H_
+#endif  // BASE_POWER_MONITOR_POWER_MONITOR_ANDROID_H_