Disable Flaky ExtensionBrowserTest.RSSParseFeedValidFeed1.

Recent flake:
http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%286%29/builds/25174

Flakiness dashboard:
http://chromium-build-logs.appspot.com/gtest_query?gtest_query=ExtensionBrowserTest.RSSParseFeedValidFeed1

BUG=340354
TEST=none
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[email protected]
NOTRY=true

Review URL: https://codereview.chromium.org/150693004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248567 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/subscribe_page_action_browsertest.cc b/chrome/browser/extensions/subscribe_page_action_browsertest.cc
index c7aa60cc..37bd56b 100644
--- a/chrome/browser/extensions/subscribe_page_action_browsertest.cc
+++ b/chrome/browser/extensions/subscribe_page_action_browsertest.cc
@@ -148,7 +148,8 @@
   ASSERT_TRUE(WaitForPageActionVisibilityChangeTo(1));
 }
 
-IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, RSSParseFeedValidFeed1) {
+// This test is flaky on all platforms; see http://crbug.com/340354
+IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, DISABLED_RSSParseFeedValidFeed1) {
   ASSERT_TRUE(test_server()->Start());
 
   const Extension* extension = LoadExtension(