Disable flaky ExtensionPreferenceApiTest.DataReductionProxy on Windows.

chrome/browser/extensions/api/preference/preference_apitest.cc

Index: chrome/browser/extensions/api/preference/preference_apitest.cc
diff --git a/chrome/browser/extensions/api/preference/preference_apitest.cc b/chrome/browser/extensions/api/preference/preference_apitest.cc
index 1ed82018dca33ae01889bb30aeb2cef063cc28f9..072851785c264968f9d7435795369bdd18d07fad 100644
--- a/chrome/browser/extensions/api/preference/preference_apitest.cc
+++ b/chrome/browser/extensions/api/preference/preference_apitest.cc
@@ -334,7 +334,12 @@ IN_PROC_BROWSER_TEST_F(ExtensionPreferenceApiTest, OnChangeSplit) {
   EXPECT_TRUE(catcher_incognito.GetNextResult()) << catcher.message();
 }
 
-IN_PROC_BROWSER_TEST_F(ExtensionPreferenceApiTest, DataReductionProxy) {
+#if defined(OS_WIN)  // http://crbug.com/477844
+#define MAYBE_DataReductionProxy DISABLED_DataReductionProxy
+#else
+#define MAYBE_DataReductionProxy DataReductionProxy
+#endif
+IN_PROC_BROWSER_TEST_F(ExtensionPreferenceApiTest, MAYBE_DataReductionProxy) {
   EXPECT_TRUE(RunExtensionTest("preference/data_reduction_proxy")) <<
       message_;
 }