extensions: disable a flaky ExtensionFetchTest

chrome/browser/extensions/fetch_apitest.cc

Index: chrome/browser/extensions/fetch_apitest.cc
diff --git a/chrome/browser/extensions/fetch_apitest.cc b/chrome/browser/extensions/fetch_apitest.cc
index 24336bae83d1ae826f3976d15ba30ee2186c06e7..9ea89c0c434c678bc435864d9bb5b49951e9024b 100644
--- a/chrome/browser/extensions/fetch_apitest.cc
+++ b/chrome/browser/extensions/fetch_apitest.cc
@@ -95,8 +95,10 @@ IN_PROC_BROWSER_TEST_F(ExtensionFetchTest, ExtensionCanFetchExtensionResource) {
           extension->id(), GetFetchScript("chrome.runtime.getURL('text')")));
 }
 
-IN_PROC_BROWSER_TEST_F(ExtensionFetchTest,
-                       ExtensionCanFetchHostedResourceWithHostPermissions) {
+// Disabled: https://crbug.com/709466
+IN_PROC_BROWSER_TEST_F(
+    ExtensionFetchTest,
+    DISABLED_ExtensionCanFetchHostedResourceWithHostPermissions) {
   TestExtensionDir dir;
   dir.WriteManifestWithSingleQuotes(
       "{"