base: Erase unused FOR_EACH_OBSERVER macro.

base/observer_list_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "base/observer_list.h"
 #include "base/observer_list_threadsafe.h"
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 588 matching lines @@
  private:
   ObserverList<Foo>* list_;
 };
 
 
 TEST(ObserverListTest, IteratorOutlivesList) {
   ObserverList<Foo>* observer_list = new ObserverList<Foo>;
   ListDestructor a(observer_list);
   observer_list->AddObserver(&a);
 
-  FOR_EACH_OBSERVER(Foo, *observer_list, Observe(0));
+  for (auto& observer : *observer_list)
+    observer.Observe(0);
   // If this test fails, there'll be Valgrind errors when this function goes out
   // of scope.
 }
 
 TEST(ObserverListTest, BasicStdIterator) {
   using FooList = ObserverList<Foo>;
   FooList observer_list;
 
   // An optimization: begin() and end() do not involve weak pointers on
   // empty list.
@@ skipping 305 matching lines @@
     // However, the first Observe() call will add a second observer: at this
     // point, it != observer_list.end() should be true, and Observe() should be
     // called on the newly added observer on the next iteration of the loop.
     observer.Observe(10);
   }
 
   EXPECT_EQ(-10, b.total);
 }
 
 }  // namespace base