Fix some oauth2 test code: put most code in anonymous namespace to avoid

chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc

Index: chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc
===================================================================
--- chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc	(revision 137883)
+++ chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc	(working copy)
@@ -119,8 +119,6 @@
   return ia;
 }
 
-}  // namespace
-
 class MockDelegate : public OAuth2MintTokenFlow::Delegate {
  public:
   MockDelegate() {}
@@ -144,6 +142,8 @@
   MOCK_METHOD0(CreateMintTokenFetcher, OAuth2MintTokenFetcher*());
 };
 
+}  // namespace
+
 class OAuth2MintTokenFlowTest : public testing::Test {
  public:
   OAuth2MintTokenFlowTest() {}