Disabling flaky test

Bug: 1021172
Change-Id: I0461cfab978517bd0d948487f785efce9df018df

TBR=rdevlin.cronin@chromium.org

Change-Id: I0461cfab978517bd0d948487f785efce9df018df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896505Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712205}

chrome/browser/extensions/api/extension_action/browser_action_apitest.cc

@@ -1103,8 +1103,14 @@ class NavigatingExtensionPopupBrowserTest : public BrowserActionApiTest {
   const Extension* other_extension_;
 };
 
+// Flaky - crbug.com/1021172
+#if defined(OS_LINUX)
+#define MAYBE_Webpage DISABLED_Webpage
+#else
+#define MAYBE_Webpage Webpage
+#endif
 // Tests that an extension pop-up cannot be navigated to a web page.
-IN_PROC_BROWSER_TEST_F(NavigatingExtensionPopupBrowserTest, Webpage) {
+IN_PROC_BROWSER_TEST_F(NavigatingExtensionPopupBrowserTest, MAYBE_Webpage) {
   GURL web_url(embedded_test_server()->GetURL("foo.com", "/title1.html"));
   TestPopupNavigationViaGet(web_url, EXPECTING_NAVIGATION_FAILURE);
   TestPopupNavigationViaPost(web_url, EXPECTING_NAVIGATION_FAILURE);