Revert "Add Accept-Encoding: br for secure Data Reduction Proxy requests."

components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options_unittest.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options_unittest.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options_unittest.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options_unittest.cc
index ade256bc4b6df9e0abc3ab75d61eda4f60095792..32cb51db7b0fd92a1472006e03ea33facd7a93c7 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options_unittest.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options_unittest.cc
@@ -357,43 +357,4 @@ TEST_F(DataReductionProxyRequestOptionsTest, GetSessionKeyFromRequestHeaders) {
   }
 }
 
-TEST_F(DataReductionProxyRequestOptionsTest, AddBrotliAcceptEncoding) {
-  const struct {
-    const char* initial_accept_encoding;
-    bool brotli_enabled;
-    const char* expected_accept_encoding;
-  } tests[] = {
-      {nullptr, true, nullptr},
-      {"", true, "br"},
-      {"gzip", true, "gzip, br"},
-      {"gzip,br,foo", true, "gzip,br,foo"},
-      {"gzip,  br  , foo", true, "gzip,  br  , foo"},
-      {"gzip", false, "gzip"},
-      {"gzip, br", false, "gzip, br"},
-  };
-
-  for (const auto& test : tests) {
-    net::URLRequestContext context;
-    context.set_enable_brotli(test.brotli_enabled);
-    auto request = context.CreateRequest(GURL("http://foo"),
-                                         net::DEFAULT_PRIORITY, nullptr);
-    net::HttpRequestHeaders request_headers;
-    if (test.initial_accept_encoding) {
-      request_headers.SetHeader(net::HttpRequestHeaders::kAcceptEncoding,
-                                test.initial_accept_encoding);
-    }
-
-    request_options()->AddBrotliAcceptEncoding(*request, &request_headers);
-
-    std::string actual_accept_encoding;
-    EXPECT_EQ(
-        request_headers.GetHeader(net::HttpRequestHeaders::kAcceptEncoding,
-                                  &actual_accept_encoding),
-        test.expected_accept_encoding != nullptr);
-    if (test.expected_accept_encoding) {
-      EXPECT_EQ(test.expected_accept_encoding, actual_accept_encoding);
-    }
-  }
-}
-
 }  // namespace data_reduction_proxy