base/version: remove wstring version

base/version.h

Index: base/version.h
diff --git a/base/version.h b/base/version.h
index 2b182bb0d1b764e19c1273e1c647b481029667b5..33f4af52359d527afd40064b4ae8773d8a3db362 100644
--- a/base/version.h
+++ b/base/version.h
@@ -12,12 +12,14 @@
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 
+// Version represents a dotted version number, like "1.2.3.4", supporting
+// parsing and comparison.
+// Each component is limited to a uint16.
 class Version {
  public:
   // The version string must be made up of 1 or more uint16's separated
   // by '.'. Returns NULL if string is not in this format.
   // Caller is responsible for freeing the Version object once done.
-  static Version* GetVersionFromString(const std::wstring& version_str);
   static Version* GetVersionFromString(const std::string& version_str);
 
   // Exposed only so that a Version can be stored in STL containers;