Clean up of -Wunused-but-set-variable (gcc 4.6)

base/system_monitor/system_monitor_unittest.cc

 // Copyright (c) 2011 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.
 
 #include "base/system_monitor/system_monitor.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 class PowerTest : public SystemMonitor::PowerObserver {
@@ skipping 29 matching lines @@
   int power_state_changes_;  // Count of OnPowerStateChange notifications.
   int suspends_;  // Count of OnSuspend notifications.
   int resumes_;  // Count of OnResume notifications.
 };
 
 TEST(SystemMonitor, PowerNotifications) {
   const int kObservers = 5;
 
   // Initialize a message loop for this to run on.
   MessageLoop loop;
-  // Initialize time() since it registers as a SystemMonitor observer.
-  base::Time now = base::Time::Now();
 
   SystemMonitor system_monitor;
   PowerTest test[kObservers];
   for (int index = 0; index < kObservers; ++index)
     system_monitor.AddObserver(&test[index]);
 
   // Send a bunch of power changes.  Since the battery power hasn't
   // actually changed, we shouldn't get notifications.
   for (int index = 0; index < 5; index++) {
     system_monitor.ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
@@ skipping 20 matching lines @@
   loop.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 1);
 
   // Send a duplicate resume notification.  This should be suppressed.
   system_monitor.ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
   loop.RunAllPending();
   EXPECT_EQ(test[0].resumes(), 1);
 }
 
 }  // namespace base