Move base to DEPS

base/scoped_observer.h

-// 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.
-
-#ifndef BASE_SCOPED_OBSERVER_H_
-#define BASE_SCOPED_OBSERVER_H_
-
-#include <algorithm>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-
-// ScopedObserver is used to keep track of the set of sources an object has
-// attached itself to as an observer. When ScopedObserver is destroyed it
-// removes the object as an observer from all sources it has been added to.
-template <class Source, class Observer>
-class ScopedObserver {
- public:
-  explicit ScopedObserver(Observer* observer) : observer_(observer) {}
-
-  ~ScopedObserver() {
-    RemoveAll();
-  }
-
-  // Adds the object passed to the constructor as an observer on |source|.
-  void Add(Source* source) {
-    sources_.push_back(source);
-    source->AddObserver(observer_);
-  }
-
-  // Remove the object passed to the constructor as an observer from |source|.
-  void Remove(Source* source) {
-    auto it = std::find(sources_.begin(), sources_.end(), source);
-    DCHECK(it != sources_.end());
-    sources_.erase(it);
-    source->RemoveObserver(observer_);
-  }
-
-  void RemoveAll() {
-    for (size_t i = 0; i < sources_.size(); ++i)
-      sources_[i]->RemoveObserver(observer_);
-    sources_.clear();
-  }
-
-  bool IsObserving(Source* source) const {
-    return std::find(sources_.begin(), sources_.end(), source) !=
-        sources_.end();
-  }
-
-  bool IsObservingSources() const { return !sources_.empty(); }
-
- private:
-  Observer* observer_;
-
-  std::vector<Source*> sources_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedObserver);
-};
-
-#endif  // BASE_SCOPED_OBSERVER_H_