Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/find_in_page/find_in_page_controller.mm

 // Copyright 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.
 
 #import "ios/chrome/browser/find_in_page/find_in_page_controller.h"
 
 #import <UIKit/UIKit.h>
+
 #import <cmath>
+#include <memory>
 
 #include "base/ios/ios_util.h"
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_model.h"
 #import "ios/chrome/browser/find_in_page/js_findinpage_manager.h"
 #import "ios/chrome/browser/web/dom_altering_lock.h"
 #import "ios/web/public/web_state/crw_web_view_proxy.h"
 #import "ios/web/public/web_state/crw_web_view_scroll_view_proxy.h"
 #import "ios/web/public/web_state/js/crw_js_injection_receiver.h"
 #import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 
 NSString* const kFindBarTextFieldWillBecomeFirstResponderNotification =
@@ skipping 49 matching lines @@
   id<FindInPageControllerDelegate> _delegate;
 
   // Access to the web view from the web state.
   base::scoped_nsprotocol<id<CRWWebViewProxy>> _webViewProxy;
 
   // True when a find is in progress. Used to avoid running JavaScript during
   // disable when there is nothing to clear.
   BOOL _findStringStarted;
 
   // Bridge to observe the web state from Objective-C.
-  scoped_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
+  std::unique_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
 }
 
 @synthesize delegate = _delegate;
 
 - (id)initWithWebState:(web::WebState*)webState
               delegate:(id<FindInPageControllerDelegate>)delegate {
   self = [super init];
   if (self) {
     DCHECK(delegate);
     _findInPageJsManager = base::mac::ObjCCastStrict<JsFindinpageManager>(
@@ skipping 281 matching lines @@
 
 - (BOOL)canReleaseDOMLock {
   return NO;
 }
 
 - (void)releaseDOMLockWithCompletionHandler:(ProceduralBlock)completionHandler {
   NOTREACHED();
 }
 
 @end