Disable flaky test on Win and Linux.

Test:
BrowserNavigatorTest.ReuseRVHWithWebUI

See bug for falkiness dashboard link and sample failure.

TBR=ellyjones

Bug: 1044335
Change-Id: Ia5c8742a82aa8f750d46f011326a0fa2edeaee24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013756Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734047}

chrome/browser/ui/browser_navigator_browsertest.cc

@@ -1818,12 +1818,19 @@ IN_PROC_BROWSER_TEST_F(BrowserNavigatorTest,
   EXPECT_EQ(base::UTF8ToUTF16(expected_url), omnibox_view->GetText());
 }
 
+#if defined(OS_LINUX) || defined(OS_WIN)
+// Flaky on Win and Linux. See https://crbug.com/1044335.
+#define MAYBE_ReuseRVHWithWebUI DISABLED_ReuseRVHWithWebUI
+#else
+#define MAYBE_ReuseRVHWithWebUI ReuseRVHWithWebUI
+#endif
+
 // Test that there's no crash when a navigation to a WebUI page reuses an
 // existing swapped out RenderViewHost.  Previously, this led to a browser
 // process crash in WebUI pages that use MojoWebUIController, which tried to
 // use the RenderViewHost's GetMainFrame() when it was invalid in
 // RenderViewCreated(). See https://crbug.com/627027.
-IN_PROC_BROWSER_TEST_F(BrowserNavigatorTest, ReuseRVHWithWebUI) {
+IN_PROC_BROWSER_TEST_F(BrowserNavigatorTest, MAYBE_ReuseRVHWithWebUI) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   // Visit a WebUI page with bindings.