Make code build in clang

The newest version of clang correctly recognizes that all values of this
enumeration are already covered by distinct cases, and that this
is unneeded.  Considering the default case does nothing, it can just be
removed entirely.

Tested:
Code compiles in clang.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I15333be16affda91d1a733e5d97aaa028a424efd
diff --git a/http/http_client.hpp b/http/http_client.hpp
index d0b07a6..f45449b 100644
--- a/http/http_client.hpp
+++ b/http/http_client.hpp
@@ -373,8 +373,6 @@
                 doClose();
                 break;
             }
-            default:
-                break;
         }
     }