Move implementation from header to source.

base/env_var.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/env_var.h"
 
 #if defined(OS_POSIX)
 #include <stdlib.h>
 #elif defined(OS_WIN)
 #include <windows.h>
@@ skipping 67 matching lines @@
     ::SetEnvironmentVariable(ASCIIToWide(variable_name).c_str(),
                              ASCIIToWide(new_value).c_str());
 #endif
   }
 };
 
 }  // namespace
 
 namespace base {
 
+EnvVarGetter::~EnvVarGetter() {}
+
+bool EnvVarGetter::HasEnv(const char* variable_name) {
+  return GetEnv(variable_name, NULL);
+}
+
 // static
 EnvVarGetter* EnvVarGetter::Create() {
   return new EnvVarGetterImpl();
 }
 
 }  // namespace base