Remove usage of base::ObserverList<T>::Iter::GetNext() in //chrome.

chrome/browser/task_manager/task_manager_interface.cc

Index: chrome/browser/task_manager/task_manager_interface.cc
diff --git a/chrome/browser/task_manager/task_manager_interface.cc b/chrome/browser/task_manager/task_manager_interface.cc
index 624f241b78e940339383d776da971db4877a1a68..9cdecf1ee89a7c7fce1e20ccc7ed2cee25bfadcf 100644
--- a/chrome/browser/task_manager/task_manager_interface.cc
+++ b/chrome/browser/task_manager/task_manager_interface.cc
@@ -76,12 +76,11 @@ void TaskManagerInterface::RemoveObserver(TaskManagerObserver* observer) {
   // Recalculate the minimum refresh rate and the enabled resource flags.
   int64_t flags = 0;
   base::TimeDelta min_time = base::TimeDelta::Max();
-  base::ObserverList<TaskManagerObserver>::Iterator itr(&observers_);
-  while (TaskManagerObserver* obs = itr.GetNext()) {
-    if (obs->desired_refresh_time() < min_time)
-      min_time = obs->desired_refresh_time();
+  for (auto& observer : observers_) {
+    if (observer.desired_refresh_time() < min_time)
+      min_time = observer.desired_refresh_time();
 
-    flags |= obs->desired_resources_flags();
+    flags |= observer.desired_resources_flags();
   }
 
   if (min_time == base::TimeDelta::Max()) {
@@ -97,9 +96,8 @@ void TaskManagerInterface::RemoveObserver(TaskManagerObserver* observer) {
 
 void TaskManagerInterface::RecalculateRefreshFlags() {
   int64_t flags = 0;
-  base::ObserverList<TaskManagerObserver>::Iterator itr(&observers_);
-  while (TaskManagerObserver* obs = itr.GetNext())
-    flags |= obs->desired_resources_flags();
+  for (auto& observer : observers_)
+    flags |= observer.desired_resources_flags();
 
   SetEnabledResourceFlags(flags);
 }