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

webkit/plugins/npapi/webplugin_delegate_impl_mac.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 #import <QuartzCore/QuartzCore.h>
 
 #include "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
 #include <string>
@@ skipping 104 matching lines @@
 
  private:
   class VisibilityGroup {
    public:
     explicit VisibilityGroup(int timer_period)
         : timer_period_(timer_period), iterator_(delegates_.end()) {}
 
     // Adds |delegate| to this visibility group.
     void RegisterDelegate(WebPluginDelegateImpl* delegate) {
       if (delegates_.empty()) {
-        timer_.Start(FROM_HERE,
-                     base::TimeDelta::FromMilliseconds(timer_period_),
+        timer_.Start(base::TimeDelta::FromMilliseconds(timer_period_),
                      this, &VisibilityGroup::SendIdleEvents);
       }
       delegates_.insert(delegate);
     }
 
     // Removes |delegate| from this visibility group.
     void UnregisterDelegate(WebPluginDelegateImpl* delegate) {
       // If a plugin changes visibility during idle event handling, it
       // may be removed from this set while SendIdleEvents is still iterating;
       // if that happens and it's next on the list, increment the iterator
@@ skipping 880 matching lines @@
 }
 
 void WebPluginDelegateImpl::PluginVisibilityChanged() {
 #ifndef NP_NO_CARBON
   if (instance()->event_model() == NPEventModelCarbon)
     UpdateIdleEventRate();
 #endif
   if (instance()->drawing_model() == NPDrawingModelCoreAnimation) {
     bool plugin_visible = container_is_visible_ && !clip_rect_.IsEmpty();
     if (plugin_visible && !redraw_timer_->IsRunning() && windowed_handle()) {
-      redraw_timer_->Start(FROM_HERE,
+      redraw_timer_->Start(
           base::TimeDelta::FromMilliseconds(kCoreAnimationRedrawPeriodMs),
           this, &WebPluginDelegateImpl::DrawLayerInSurface);
     } else if (!plugin_visible) {
       redraw_timer_->Stop();
     }
   }
 }
 
 void WebPluginDelegateImpl::StartIme() {
   // Currently the plugin IME implementation only works on 10.6.
@@ skipping 171 matching lines @@
   qd_manager_->SetFastPathEnabled(enabled);
   qd_port_.port = qd_manager_->port();
   WindowlessSetWindow();
   // Send a paint event so that the new buffer gets updated immediately.
   WindowlessPaint(buffer_context_, clip_rect_);
 }
 #endif  // !NP_NO_QUICKDRAW
 
 }  // namespace npapi
 }  // namespace webkit