Tweak omnibox parsing heuristics more:

chrome/browser/autocomplete/autocomplete.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 246 matching lines @@
   // Code that wants to format URLs with a format flag including
   // net::kFormatUrlOmitTrailingSlashOnBareHostname risk changing the meaning if
   // the result is then parsed as AutocompleteInput.  Such code can call this
   // function with the URL and its formatted string, and it will return a
   // formatted string with the same meaning as the original URL (i.e. it will
   // re-append a slash if necessary).
   static string16 FormattedStringWithEquivalentMeaning(
       const GURL& url,
       const string16& formatted_url);
 
+  // Returns the number of non-empty components in |parts| besides the host.
+  static int NumNonHostComponents(const url_parse::Parsed& parts);
+
   // User-provided text to be completed.
   const string16& text() const { return text_; }
 
   // Use of this setter is risky, since no other internal state is updated
   // besides |text_| and |parts_|.  Only callers who know that they're not
   // changing the type/scheme/etc. should use this.
   void UpdateText(const string16& text, const url_parse::Parsed& parts);
 
   // User's desired TLD, if one is not already present in the text to
   // autocomplete.  When this is non-empty, it also implies that "www." should
@@ skipping 472 matching lines @@
   AutocompleteInput::Type input_type;
   // Selected index (if selected) or -1 (AutocompletePopupModel::kNoMatch).
   size_t selected_index;
   // Inline autocompleted length (if displayed).
   size_t inline_autocompleted_length;
   // Result set.
   const AutocompleteResult& result;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_H_