base: Get rid of the deprecated SysInfo::GetEnvVar.

base/sys_info_win.cc

Index: base/sys_info_win.cc
diff --git a/base/sys_info_win.cc b/base/sys_info_win.cc
index 35a7878b3fd7e3e84b031208563c1f634bf9216a..ed4d2fb254576cc34542e1796e4c1306522d1216 100644
--- a/base/sys_info_win.cc
+++ b/base/sys_info_win.cc
@@ -48,17 +48,6 @@ int64 SysInfo::AmountOfFreeDiskSpace(const FilePath& path) {
 }
 
 // static
-std::wstring SysInfo::GetEnvVar(const wchar_t* var) {
-  DWORD value_length = GetEnvironmentVariable(var, NULL, 0);
-  if (value_length == 0) {
-    return L"";
-  }
-  scoped_array<wchar_t> value(new wchar_t[value_length]);
-  GetEnvironmentVariable(var, value.get(), value_length);
-  return std::wstring(value.get());
-}
-
-// static
 std::string SysInfo::OperatingSystemName() {
   return "Windows NT";
 }