Remove unused line from PhoneWindowManager.

Change-Id: I2b2dc1f08e32b2731409fcf192712ca0cc269f0a
diff --git a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
index 8e83255..ce6166a 100644
--- a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
+++ b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
@@ -5040,7 +5040,6 @@
     @Override
     public void keepScreenOnStoppedLw() {
         if (mKeyguardDelegate != null && !mKeyguardDelegate.isShowingAndNotHidden()) {
-            long curTime = SystemClock.uptimeMillis();
             mPowerManager.userActivity(SystemClock.uptimeMillis(), false);
         }
     }