Fixed NavigationItemImpl::GetDisplayTitleForURL for 'file://' URL.

ios/web/navigation/navigation_item_impl.mm

 // Copyright 2014 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/navigation/navigation_item_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 279 matching lines @@
 // static
 base::string16 NavigationItemImpl::GetDisplayTitleForURL(const GURL& url) {
   if (url.is_empty())
     return base::string16();
 
   base::string16 title = url_formatter::FormatUrl(url);
 
   // For file:// URLs use the filename as the title, not the full path.
   if (url.SchemeIsFile()) {
     base::string16::size_type slashpos = title.rfind('/');
-    if (slashpos != base::string16::npos)
+    if (slashpos != base::string16::npos && slashpos != (title.size() - 1))
       title = title.substr(slashpos + 1);
   }
 
   const size_t kMaxTitleChars = 4 * 1024;
   gfx::ElideString(title, kMaxTitleChars, &title);
   return title;
 }
 
 #ifndef NDEBUG
 NSString* NavigationItemImpl::GetDescription() const {
   return [NSString
       stringWithFormat:
           @"url:%s originalurl:%s title:%s transition:%d displayState:%@ "
           @"userAgentType:%s",
           url_.spec().c_str(), original_request_url_.spec().c_str(),
           base::UTF16ToUTF8(title_).c_str(), transition_type_,
           page_display_state_.GetDescription(),
           GetUserAgentTypeDescription(user_agent_type_).c_str()];
 }
 #endif
 
 }  // namespace web