[Clean Skeleton] Migrate code to clean/

ios/clean/chrome/browser/browser_coordinator.mm

 // Copyright 2016 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.
 
 // ======                        New Architecture                         =====
 // =         This code is only used in the new iOS Chrome architecture.       =
 // ============================================================================
 
 #import "base/logging.h"
-#import "ios/chrome/browser/browser_coordinator+internal.h"
-#import "ios/chrome/browser/browser_coordinator.h"
+#import "ios/clean/chrome/browser/browser_coordinator+internal.h"
+#import "ios/clean/chrome/browser/browser_coordinator.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface BrowserCoordinator ()
 // Child coordinators owned by this object.
 @property(nonatomic, strong)
     NSMutableSet<BrowserCoordinator*>* childCoordinators;
 // Parent coordinator of this object, if any.
@@ skipping 82 matching lines @@
 - (BOOL)canAddOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator {
   // By default, coordinators with no other children can add an overlay.
   return self.childCoordinators.count == 0;
 }
 
 - (void)removeChildCoordinator:(BrowserCoordinator*)coordinator {
   [self.childCoordinators removeObject:coordinator];
 }
 
 @end