Simplify VersionInfo code, avoid hitting sandbox IPC constantly on Windows

chrome/common/chrome_version_info.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_COMMON_CHROME_VERSION_INFO_H_
 #define CHROME_COMMON_CHROME_VERSION_INFO_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 12 matching lines @@
     CHANNEL_UNKNOWN = 0,  // Probably blue
     CHANNEL_CANARY,       // Yellow
     CHANNEL_DEV,          // Technicolor
     CHANNEL_BETA,         // Rainbow
     CHANNEL_STABLE        // Full-spectrum
   };
 
   VersionInfo();
   ~VersionInfo();
 
-  // In the rare case where we fail to get the version info,
-  // is_valid() will return false.  The other functions will return
-  // the empty string in this case, so it's not harmful if you don't
-  // check is_valid().
-  bool is_valid() const;
-
   // E.g. "Chrome/a.b.c.d"
   std::string ProductNameAndVersionForUserAgent() const;
 
   // E.g. "Chromium" or "Google Chrome".
   std::string Name() const;
 
   // Version number, e.g. "6.0.490.1".
   std::string Version() const;
 
   // The SVN revision of this release.  E.g. "55800".
@@ skipping 37 matching lines @@
 #if defined(OS_WIN) || defined(OS_MACOSX)
   scoped_ptr<FileVersionInfo> version_info_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(VersionInfo);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_VERSION_INFO_H_