Move ContentSuggestions identifiers to custom target

ios/chrome/browser/ui/content_suggestions/identifier/content_suggestion_identifier.mm

 // Copyright 2017 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/ui/content_suggestions/content_suggestion_identifier.h"
+#import "ios/chrome/browser/ui/content_suggestions/identifier/content_suggestion_identifier.h"
 
 #include "base/mac/foundation_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @implementation ContentSuggestionIdentifier
 
 @synthesize sectionInfo = _sectionInfo;
@@ skipping 11 matching lines @@
   }
 
   ContentSuggestionIdentifier* other =
       base::mac::ObjCCastStrict<ContentSuggestionIdentifier>(object);
 
   return self.sectionInfo == other.sectionInfo &&
          self.IDInSection == other.IDInSection;
 }
 
 @end