Revert "Currently, base/timer.cc calls PostTask with FROM_HERE as the Location,

base/timer.h

Index: base/timer.h
diff --git a/base/timer.h b/base/timer.h
index 30cb10900d8216f4e79fbe5b640c9a39bc171e66..2e21582a9a0ab8404bc981c6db2f120f6f31ed6b 100644
--- a/base/timer.h
+++ b/base/timer.h
@@ -87,14 +87,9 @@ class BASE_EXPORT BaseTimer_Helper {
   // We have access to the timer_ member so we can orphan this task.
   class TimerTask : public Task {
    public:
-    TimerTask(const tracked_objects::Location& posted_from,
-              TimeDelta delay)
-        : posted_from_(posted_from),
-          timer_(NULL),
-          delay_(delay) {
+    explicit TimerTask(TimeDelta delay) : timer_(NULL), delay_(delay) {
     }
     virtual ~TimerTask() {}
-    tracked_objects::Location posted_from_;
     BaseTimer_Helper* timer_;
     TimeDelta delay_;
   };
@@ -121,12 +116,9 @@ class BaseTimer : public BaseTimer_Helper {
 
   // Call this method to start the timer.  It is an error to call this method
   // while the timer is already running.
-  void Start(const tracked_objects::Location& posted_from,
-             TimeDelta delay,
-             Receiver* receiver,
-             ReceiverMethod method) {
+  void Start(TimeDelta delay, Receiver* receiver, ReceiverMethod method) {
     DCHECK(!IsRunning());
-    InitiateDelayedTask(new TimerTask(posted_from, delay, receiver, method));
+    InitiateDelayedTask(new TimerTask(delay, receiver, method));
   }
 
   // Call this method to stop the timer.  It is a no-op if the timer is not
@@ -146,11 +138,8 @@ class BaseTimer : public BaseTimer_Helper {
 
   class TimerTask : public BaseTimer_Helper::TimerTask {
    public:
-    TimerTask(const tracked_objects::Location& posted_from,
-              TimeDelta delay,
-              Receiver* receiver,
-              ReceiverMethod method)
-        : BaseTimer_Helper::TimerTask(posted_from, delay),
+    TimerTask(TimeDelta delay, Receiver* receiver, ReceiverMethod method)
+        : BaseTimer_Helper::TimerTask(delay),
           receiver_(receiver),
           method_(method) {
     }
@@ -173,7 +162,7 @@ class BaseTimer : public BaseTimer_Helper {
     }
 
     TimerTask* Clone() const {
-      return new TimerTask(posted_from_, delay_, receiver_, method_);
+      return new TimerTask(delay_, receiver_, method_);
     }
 
    private:
@@ -232,12 +221,8 @@ class DelayTimer {
  public:
   typedef void (Receiver::*ReceiverMethod)();
 
-  DelayTimer(const tracked_objects::Location& posted_from,
-             TimeDelta delay,
-             Receiver* receiver,
-             ReceiverMethod method)
-      : posted_from_(posted_from),
-        receiver_(receiver),
+  DelayTimer(TimeDelta delay, Receiver* receiver, ReceiverMethod method)
+      : receiver_(receiver),
         method_(method),
         delay_(delay) {
   }
@@ -257,7 +242,7 @@ class DelayTimer {
 
     // The timer isn't running, or will expire too late, so restart it.
     timer_.Stop();
-    timer_.Start(posted_from_, delay, this, &DelayTimer<Receiver>::Check);
+    timer_.Start(delay, this, &DelayTimer<Receiver>::Check);
   }
 
   void Check() {
@@ -274,7 +259,6 @@ class DelayTimer {
     (receiver_->*method_)();
   }
 
-  tracked_objects::Location posted_from_;
   Receiver *const receiver_;
   const ReceiverMethod method_;
   const TimeDelta delay_;