Add more information to about:version and "About Chromium" dialog

chrome/common/chrome_version_info.h

Index: chrome/common/chrome_version_info.h
diff --git a/chrome/common/chrome_version_info.h b/chrome/common/chrome_version_info.h
index 2c9cf52c16a9887458e578d790feb73e9e8b4816..6d509ca63e478f473bbc83d5d39502a710ad8052 100644
--- a/chrome/common/chrome_version_info.h
+++ b/chrome/common/chrome_version_info.h
@@ -37,6 +37,9 @@ class VersionInfo {
   // The SVN revision of this release.  E.g. "55800".
   std::string LastChange() const;
 
+  // OS type. E.g. "Windows", "Linux", "FreeBSD", ...
+  std::string OSType() const;
+
   // Whether this is an "official" release of the current Version():
   // whether knowing Version() is enough to completely determine what
   // LastChange() is.