Handle invalid URLs in share extension.

ios/chrome/browser/share_extension/share_extension_item_receiver.mm

 // Copyright 2016 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/chrome/browser/share_extension/share_extension_item_receiver.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/ios/block_types.h"
 #include "base/mac/bind_objc_block.h"
@@ skipping 171 matching lines @@
 
   GURL entryURL =
       net::GURLWithNSURL([entry objectForKey:app_group::kShareItemURL]);
   std::string entryTitle =
       base::SysNSStringToUTF8([entry objectForKey:app_group::kShareItemTitle]);
   NSDate* entryDate = base::mac::ObjCCast<NSDate>(
       [entry objectForKey:app_group::kShareItemDate]);
   NSNumber* entryType = base::mac::ObjCCast<NSNumber>(
       [entry objectForKey:app_group::kShareItemType]);
 
-  if (!entryURL.is_valid() || !entryDate || !entryType) {
+  if (!entryURL.is_valid() || !entryDate || !entryType ||
+      !entryURL.SchemeIsHTTPOrHTTPS()) {
     if (completion) {
       completion();
     }
     return NO;
   }
 
   UMA_HISTOGRAM_TIMES("IOS.ShareExtension.ReceivedEntryDelay",
                       base::TimeDelta::FromSecondsD(
                           [[NSDate date] timeIntervalSinceDate:entryDate]));
 
@@ skipping 139 matching lines @@
 
 - (NSOperationQueue*)presentedItemOperationQueue {
   return [NSOperationQueue mainQueue];
 }
 
 - (NSURL*)presentedItemURL {
   return app_group::ShareExtensionItemsFolder();
 }
 
 @end