Move base to DEPS

base/ios/weak_nsobject.mm

-// Copyright 2013 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/ios/weak_nsobject.h"
-
-#include "base/mac/scoped_nsautorelease_pool.h"
-#include "base/mac/scoped_nsobject.h"
-
-namespace {
-// The key needed by objc_setAssociatedObject.
-char sentinelObserverKey_;
-}
-
-@interface CRBWeakNSProtocolSentinel ()
-// Container to notify on dealloc.
-@property(readonly, assign) scoped_refptr<base::WeakContainer> container;
-// Designed initializer.
-- (id)initWithContainer:(scoped_refptr<base::WeakContainer>)container;
-@end
-
-@implementation CRBWeakNSProtocolSentinel
-
-@synthesize container = container_;
-
-+ (scoped_refptr<base::WeakContainer>)containerForObject:(id)object {
-  if (object == nil)
-    return nullptr;
-  // The autoreleasePool is needed here as the call to objc_getAssociatedObject
-  // returns an autoreleased object which is better released sooner than later.
-  base::mac::ScopedNSAutoreleasePool pool;
-  CRBWeakNSProtocolSentinel* sentinel =
-      objc_getAssociatedObject(object, &sentinelObserverKey_);
-  if (!sentinel) {
-    base::scoped_nsobject<CRBWeakNSProtocolSentinel> newSentinel(
-        [[CRBWeakNSProtocolSentinel alloc]
-            initWithContainer:new base::WeakContainer(object)]);
-    sentinel = newSentinel;
-    objc_setAssociatedObject(object, &sentinelObserverKey_, sentinel,
-                             OBJC_ASSOCIATION_RETAIN);
-    // The retain count is 2. One retain is due to the alloc, the other to the
-    // association with the weak object.
-    DCHECK_EQ(2u, [sentinel retainCount]);
-  }
-  return [sentinel container];
-}
-
-- (id)initWithContainer:(scoped_refptr<base::WeakContainer>)container {
-  DCHECK(container.get());
-  self = [super init];
-  if (self)
-    container_ = container;
-  return self;
-}
-
-- (void)dealloc {
-  self.container->nullify();
-  [super dealloc];
-}
-
-@end