iOS: Cache the result of IsRunningOnIOS10OrLater()

base/ios/ios_util.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.
 
 #include "base/ios/ios_util.h"
 
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 11 matching lines @@
 }
 
 std::string* g_icudtl_path_override = nullptr;
 
 }  // namespace
 
 namespace base {
 namespace ios {
 
 bool IsRunningOnIOS10OrLater() {
-  return IsRunningOnOrLater(10, 0, 0);
+  static const bool is_running_on_or_later = IsRunningOnOrLater(10, 0, 0);
+  return is_running_on_or_later;
 }
 
 bool IsRunningOnIOS11OrLater() {
-  return IsRunningOnOrLater(11, 0, 0);
+  static const bool is_running_on_or_later = IsRunningOnOrLater(11, 0, 0);
+  return is_running_on_or_later;
 }
 
 bool IsRunningOnOrLater(int32_t major, int32_t minor, int32_t bug_fix) {
   static const int32_t* current_version = OSVersionAsArray();
   int32_t version[] = {major, minor, bug_fix};
   for (size_t i = 0; i < arraysize(version); i++) {
     if (current_version[i] != version[i])
       return current_version[i] > version[i];
   }
   return true;
@@ skipping 11 matching lines @@
 
 FilePath FilePathOfEmbeddedICU() {
   if (g_icudtl_path_override) {
     return FilePath(*g_icudtl_path_override);
   }
   return FilePath();
 }
 
 }  // namespace ios
 }  // namespace base