Simplify VersionInfo code, avoid hitting sandbox IPC constantly on Windows

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 3ebe6fce5d011254ee902555afedbe08b51c46b4..4f3d3be4a2013861e0854724ef00e0c52bafb945 100644
--- a/chrome/common/chrome_version_info.h
+++ b/chrome/common/chrome_version_info.h
@@ -30,12 +30,6 @@ class VersionInfo {
   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;