Picker takes a vector of pairs, and passes back the user chosen target.

chrome/browser/ui/browser_dialogs.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 CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 #define CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
+#include "base/optional.h"

[Matt Giuca, 2017/01/31 07:28:02]

Need base/strings/string16 as well.

[constantina, 2017/01/31 23:29:42]

Done.

 #include "build/build_config.h"
 #include "chrome/browser/ui/bookmarks/bookmark_editor.h"
-#include "chrome/browser/webshare/share_service_impl.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/native_widget_types.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/arc/intent_helper/arc_navigation_throttle.h"
 #endif  // OS_CHROMEOS
 
 class Browser;
 class ContentSettingBubbleModel;
 class GURL;
@@ skipping 132 matching lines @@
 payments::PaymentRequestDialog* CreatePaymentRequestDialog(
     payments::PaymentRequest* request);
 
 // Shows the dialog to choose a share target app. |targets| is a list of app
 // titles that will be shown in a list. Calls |callback| with SHARE if an app
 // was chosen, or CANCEL if the dialog was cancelled.
 // TODO(mgiuca): Callback should provide info about the picked app.
 void ShowWebShareTargetPickerDialog(
     gfx::NativeWindow parent_window,
     const std::vector<base::string16>& targets,
-    const base::Callback<void(SharePickerResult)>& callback);
+    const base::Callback<void(base::Optional<base::string16>)>& callback);
 
 #if defined(OS_MACOSX)
 
 // This is a class so that it can be friended from ContentSettingBubbleContents,
 // which allows it to call SetAnchorRect().
 class ContentSettingBubbleViewsBridge {
  public:
   static void Show(gfx::NativeView parent_view,
                    ContentSettingBubbleModel* model,
                    content::WebContents* web_contents,
@@ skipping 23 matching lines @@
 using BubbleShowPtr =
     void (*)(content::WebContents*,
              const std::vector<arc::ArcNavigationThrottle::AppInfo>&,
              const IntentPickerResponse&);
 
 BubbleShowPtr ShowIntentPickerBubble();
 
 #endif  // OS_CHROMEOS
 
 #endif  // CHROME_BROWSER_UI_BROWSER_DIALOGS_H_