Removed uses of IsRunningOnIOS9OrLater in crw_web_ or wk_web_view_

ios/web/web_state/ui/wk_web_view_configuration_provider.mm

 // Copyright 2015 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/web/web_state/ui/wk_web_view_configuration_provider.h"
 
 #import <Foundation/Foundation.h>
 #import <WebKit/WebKit.h>
 
 #include "base/ios/ios_util.h"
@@ skipping 40 matching lines @@
     : is_off_the_record_(is_off_the_record) {}
 
 WKWebViewConfigurationProvider::~WKWebViewConfigurationProvider() {
 }
 
 WKWebViewConfiguration*
 WKWebViewConfigurationProvider::GetWebViewConfiguration() {
   DCHECK([NSThread isMainThread]);
   if (!configuration_) {
     configuration_.reset([[WKWebViewConfiguration alloc] init]);
-    if (is_off_the_record_ && base::ios::IsRunningOnIOS9OrLater()) {
-      // WKWebsiteDataStore is iOS9 only.
+    if (is_off_the_record_) {
       [configuration_
           setWebsiteDataStore:[WKWebsiteDataStore nonPersistentDataStore]];
     }
 // TODO(crbug.com/620878) Remove these guards after moving to iOS10 SDK.
 #if defined(__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
     if (base::ios::IsRunningOnIOS10OrLater()) {
       [configuration_ setDataDetectorTypes:WKDataDetectorTypeCalendarEvent |
                                            WKDataDetectorTypeFlightNumber |
                                            WKDataDetectorTypePhoneNumber];
     }
@@ skipping 32 matching lines @@
   configuration_.reset();
   router_.reset();
   // Make sure that no one retains configuration, router, processPool.
   DCHECK(!weak_configuration);
   DCHECK(!weak_router);
   // TODO(crbug.com/522672): Enable this DCHECK.
   // DCHECK(!weak_process_pool);
 }
 
 }  // namespace web