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

base/sys_info_posix.cc

Index: base/sys_info_posix.cc
diff --git a/base/sys_info_posix.cc b/base/sys_info_posix.cc
index f2d75d29de3f01ccc500c6f6b7f4fafdd5383079..3f487e523deee7703ac0f440aa6592608cbe54c3 100644
--- a/base/sys_info_posix.cc
+++ b/base/sys_info_posix.cc
@@ -47,17 +47,6 @@ int64 SysInfo::AmountOfFreeDiskSpace(const FilePath& path) {
 }
 
 // static
-std::wstring SysInfo::GetEnvVar(const wchar_t* var) {
-  std::string var_utf8 = WideToUTF8(std::wstring(var));
-  char* value = getenv(var_utf8.c_str());
-  if (!value) {
-    return std::wstring();
-  } else {
-    return UTF8ToWide(value);
-  }
-}
-
-// static
 std::string SysInfo::OperatingSystemName() {
   utsname info;
   if (uname(&info) < 0) {