Revert "Revert "Const-ify RefCountedThreadSafe::AddRef and Release.""

chrome/common/net/url_fetcher_unittest.cc

Index: chrome/common/net/url_fetcher_unittest.cc
diff --git a/chrome/common/net/url_fetcher_unittest.cc b/chrome/common/net/url_fetcher_unittest.cc
index 3fc8469186024d3b33ed7e862c8ee2c4e3c84b1e..512f38b35747b8c5dac8c02a1c319e2dec564953 100644
--- a/chrome/common/net/url_fetcher_unittest.cc
+++ b/chrome/common/net/url_fetcher_unittest.cc
@@ -34,7 +34,7 @@ class TestURLRequestContextGetter : public URLRequestContextGetter {
       context_ = new TestURLRequestContext();
     return context_;
   }
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() {
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const {
     return io_message_loop_proxy_;
   }
 
@@ -199,7 +199,7 @@ class CancelTestURLRequestContextGetter : public URLRequestContextGetter {
     }
     return context_;
   }
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() {
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const {
     return io_message_loop_proxy_;
   }
   void WaitForContextCreation() {