[ios] Fix omnibox baseWritingDirection and dismissal iOS11 bugs.

base/ios/ios_util.h

 // 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.
 
 #ifndef BASE_IOS_IOS_UTIL_H_
 #define BASE_IOS_IOS_UTIL_H_
 
 #include <stdint.h>
 
 #include "base/base_export.h"
 #include "base/files/file_path.h"
 
 namespace base {
 namespace ios {
 
+// Returns whether the operating system is iOS 11 or later.
+BASE_EXPORT bool IsRunningOnIOS11OrLater();
+
 // Returns whether the operating system is iOS 10 or later.
 BASE_EXPORT bool IsRunningOnIOS10OrLater();
 
 // Returns whether the operating system is at the given version or later.
 BASE_EXPORT bool IsRunningOnOrLater(int32_t major,
                                     int32_t minor,
                                     int32_t bug_fix);
 
 // Returns whether iOS is signalling that an RTL text direction should be used
 // regardless of the current locale. This should not return true if the current
 // language is a "real" RTL language such as Arabic or Urdu; it should only
 // return true in cases where the RTL text direction has been forced (for
 // example by using the "RTL Psuedolanguage" option when launching from XCode).
 BASE_EXPORT bool IsInForcedRTL();
 
 // Stores the |path| of the ICU dat file in a global to be referenced later by
 // FilePathOfICUFile().  This should only be called once.
 BASE_EXPORT void OverridePathOfEmbeddedICU(const char* path);
 
 // Returns the overriden path set by OverridePathOfEmbeddedICU(), otherwise
 // returns invalid FilePath.
 BASE_EXPORT FilePath FilePathOfEmbeddedICU();
 
 }  // namespace ios
 }  // namespace base
 
 #endif  // BASE_IOS_IOS_UTIL_H_