[Sync] Make chrome sync response compression as default

sync/internal_api/http_bridge_unittest.cc

Index: sync/internal_api/http_bridge_unittest.cc
diff --git a/sync/internal_api/http_bridge_unittest.cc b/sync/internal_api/http_bridge_unittest.cc
index 55dfd1954accad02125a94895bac62dd0073ecc7..e006b8c5aa7193b2880e3d2ad3c28d62cfb63238 100644
--- a/sync/internal_api/http_bridge_unittest.cc
+++ b/sync/internal_api/http_bridge_unittest.cc
@@ -313,10 +313,6 @@ TEST_F(MAYBE_SyncHttpBridgeTest, TestMakeSynchronousPostLiveComprehensive) {
                        http_bridge->GetResponseContentLength());
   EXPECT_EQ(std::string::npos, response.find("Cookie:"));
   EXPECT_NE(std::string::npos,
-            response.find(base::StringPrintf(
-                "%s: %s", net::HttpRequestHeaders::kAcceptEncoding,
-                "deflate")));
-  EXPECT_NE(std::string::npos,
             response.find(base::StringPrintf("%s: %s",
                           net::HttpRequestHeaders::kUserAgent, kUserAgent)));
   EXPECT_NE(std::string::npos, response.find(test_payload.c_str()));