[ios] Removed SDK guards around |serverTrust| call in CRWWebController.

ios/web/web_state/ui/crw_web_controller.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.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #import <objc/runtime.h>
 #include <stddef.h>
@@ skipping 4506 matching lines @@
 
   if (!_SSLStatusUpdater) {
     _SSLStatusUpdater.reset([[CRWSSLStatusUpdater alloc]
         initWithDataSource:self
          navigationManager:navManager]);
     [_SSLStatusUpdater setDelegate:self];
   }
   NSString* host = base::SysUTF8ToNSString(_documentURL.host());
   BOOL hasOnlySecureContent = [_webView hasOnlySecureContent];
   base::ScopedCFTypeRef<SecTrustRef> trust;
-// TODO(crbug.com/628696): 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()) {
     trust.reset([_webView serverTrust], base::scoped_policy::RETAIN);
   } else {
     trust = web::CreateServerTrustFromChain([_webView certificateChain], host);
   }
-#else
-  trust = web::CreateServerTrustFromChain([_webView certificateChain], host);
-#endif
 
   [_SSLStatusUpdater updateSSLStatusForNavigationItem:currentNavItem
                                          withCertHost:host
                                                 trust:std::move(trust)
                                  hasOnlySecureContent:hasOnlySecureContent];
 }
 
 - (void)didUpdateSSLStatusForCurrentNavigationItem {
   if ([_delegate respondsToSelector:
           @selector(
@@ skipping 1180 matching lines @@
   }
 
   return web::WEB_VIEW_DOCUMENT_TYPE_GENERIC;
 }
 
 - (NSString*)refererFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:@"Referer"];
 }
 
 @end