Move base to DEPS

base/ios/crb_protocol_observers.h

-// Copyright 2014 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_IOS_CRB_PROTOCOL_OBSERVERS_H_
-#define BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_
-
-#import <Foundation/Foundation.h>
-
-typedef void (^ExecutionWithObserverBlock)(id);
-
-// Implements a container for observers that implement a specific Objective-C
-// protocol. The container forwards method invocations to its contained
-// observers, so that sending a message to all the observers is as simple as
-// sending the message to the container.
-// It is safe for an observer to remove itself or another observer while being
-// notified. It is also safe to add an other observer while being notified but
-// the newly added observer will not be notified as part of the current
-// notification dispatch.
-@interface CRBProtocolObservers : NSObject
-
-// The Objective-C protocol that the observers in this container conform to.
-@property(nonatomic, readonly) Protocol* protocol;
-
-// Returns a CRBProtocolObservers container for observers that conform to
-// |protocol|.
-+ (instancetype)observersWithProtocol:(Protocol*)protocol;
-
-// Adds |observer| to this container.
-- (void)addObserver:(id)observer;
-
-// Remove |observer| from this container.
-- (void)removeObserver:(id)observer;
-
-// Returns true if there are currently no observers.
-- (BOOL)empty;
-
-// Executes callback on every observer. |callback| cannot be nil.
-- (void)executeOnObservers:(ExecutionWithObserverBlock)callback;
-
-@end
-
-#endif  // BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_