Implement an ObjC wrapper for fetching account chooser avatar images.

chrome/browser/ui/cocoa/passwords/account_avatar_fetcher_manager.mm

+// Copyright 2015 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.
+
+#import "chrome/browser/ui/cocoa/passwords/account_avatar_fetcher_manager.h"
+
+#include "base/memory/weak_ptr.h"
+#import "chrome/browser/ui/cocoa/passwords/credential_item_view.h"
+#include "chrome/browser/ui/passwords/account_avatar_fetcher.h"
+#include "chrome/browser/ui/passwords/manage_passwords_view_utils.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/image/image_skia_util_mac.h"
+
+class AccountAvatarFetcherBridge;
+
+@interface AccountAvatarFetcherManager()
+- (void)updateAvatar:(NSImage*)image
+          fromBridge:(AccountAvatarFetcherBridge*)bridge
+             forView:(CredentialItemView*)view;
+@end
+
+class AccountAvatarFetcherBridge
+    : public AccountAvatarFetcherDelegate,
+      public base::SupportsWeakPtr<AccountAvatarFetcherBridge> {
+ public:
+  AccountAvatarFetcherBridge(AccountAvatarFetcherManager* manager,
+                             CredentialItemView* view);
+  virtual ~AccountAvatarFetcherBridge();
+
+  // AccountAvatarFetcherDelegate:
+  void UpdateAvatar(const gfx::ImageSkia& image) override;
+
+ private:
+  AccountAvatarFetcherManager* manager_;
+  CredentialItemView* view_;
+};
+
+AccountAvatarFetcherBridge::AccountAvatarFetcherBridge(
+    AccountAvatarFetcherManager* manager,
+    CredentialItemView* view)
+    : manager_(manager), view_(view) {
+}
+
+AccountAvatarFetcherBridge::~AccountAvatarFetcherBridge() = default;
+
+void AccountAvatarFetcherBridge::UpdateAvatar(const gfx::ImageSkia& image) {
+  [manager_
+      updateAvatar:gfx::NSImageFromImageSkia(ScaleImageForAccountAvatar(image))
+        fromBridge:this
+           forView:view_];
+}
+
+@implementation AccountAvatarFetcherManager
+
+- (id)initWithRequestContext:
+        (scoped_refptr<net::URLRequestContextGetter>)requestContext {
+  if ((self = [super init])) {
+    requestContext_ = requestContext;
+  }
+  return self;
+}
+
+- (void)startRequestWithFetcher:(AccountAvatarFetcher*)fetcher {
+  fetcher->Start(requestContext_.get());
+}
+
+- (void)fetchAvatar:(const GURL&)avatarURL forView:(CredentialItemView*)view {
+  scoped_ptr<AccountAvatarFetcherBridge> bridge(
+      new AccountAvatarFetcherBridge(self, view));
+  AccountAvatarFetcher* fetcher =
+      new AccountAvatarFetcher(avatarURL, bridge->AsWeakPtr());
+  bridges_.push_back(bridge.Pass());
+  [self startRequestWithFetcher:fetcher];
+}
+
+- (void)updateAvatar:(NSImage*)image
+          fromBridge:(AccountAvatarFetcherBridge*)bridge
+             forView:(CredentialItemView*)view {
+  [view updateAvatar:image];
+  auto it = std::find(bridges_.begin(), bridges_.end(), bridge);

[groby-ooo-7-16, 2015/02/12 01:07:57]

You could simplify the three lines to
bridges_.erase(std::remove(bridges_.begin(), bridges_.end(), bridge),
bridges_.end());

Your call if you think that's simpler or more complex.

[dconnelly, 2015/02/17 10:17:47]

Done.

+  if (it != bridges_.end())
+    bridges_.erase(it);
+}
+
+@end