Create OpenClose browser test for TaskManager with necessary refactoring....

chrome/browser/task_manager.cc

Index: chrome/browser/task_manager.cc
===================================================================
--- chrome/browser/task_manager.cc	(revision 16479)
+++ chrome/browser/task_manager.cc	(working copy)
@@ -710,9 +710,10 @@
   task_manager->view_->OpenWindow();
 }
 
+// static
 void TaskManager::Close() {
-  model_->StopUpdating();
-  model_->Clear();
+  TaskManager* task_manager = GetInstance();
+  task_manager->view_->CloseWindow();
 }
 
 // static
@@ -802,6 +803,11 @@
   model_->RemoveResource(resource);
 }
 
+void TaskManager::OnWindowClosed() {
+  model_->StopUpdating();
+  model_->Clear();
+}
+
 // static
 TaskManager* TaskManager::GetInstance() {
   return Singleton<TaskManager>::get();