[ios] Removed CHECK that URL passed to setDocumentURL: is invalid.

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 1469 matching lines @@
 
 - (void)replaceStateWithPageURL:(const GURL&)pageUrl
                     stateObject:(NSString*)stateObject {
   [[self sessionController] updateCurrentEntryWithURL:pageUrl
                                           stateObject:stateObject];
   [self didUpdateHistoryStateWithPageURL:pageUrl];
 }
 
 - (void)setDocumentURL:(const GURL&)newURL {
   if (newURL != _documentURL) {
-    CHECK(newURL.is_valid());
     _documentURL = newURL;
     _interactionRegisteredSinceLastURLChange = NO;
   }
 }
 
 - (BOOL)isCurrentNavigationItemPOST {
   // |_pendingNavigationInfo| will be nil if the decidePolicy* delegate methods
   // were not called.
   NSString* HTTPMethod =
       _pendingNavigationInfo
@@ skipping 4128 matching lines @@
   }
 
   return web::WEB_VIEW_DOCUMENT_TYPE_GENERIC;
 }
 
 - (NSString*)refererFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:@"Referer"];
 }
 
 @end