Revert of Disable a test that fails under ASan and MSan (patchset #1 id:1 of...

Revert of Disable a test that fails under ASan and MSan (patchset #1 id:1 of https://codereview.chromium.org/1007293002/)

Reason for revert:
This test is a victim of a bigger issue of main renderer message loop being used after it is deleted. Details are in crbug.com/467369.

I've also run the test with ASAN locally and didn't reproduce after a few runs.

Original issue's description:
> Disable a test that fails under ASan and MSan
>
> It can be flaky in other configurations as well
>
> BUG=467483
> TBR=nasko
>
> Committed: https://crrev.com/992ff715f61e90562983139ac31392b72e716822
> Cr-Commit-Position: refs/heads/master@{#320713}

TBR=timurrrr@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=467483

Review URL: https://codereview.chromium.org/1018443002

Cr-Commit-Position: refs/heads/master@{#320755}

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc

@@ -608,8 +608,7 @@ IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, History) {
   ASSERT_TRUE(RunExtensionTest("webnavigation/history")) << message_;
 }
 
-// Disabled because of http://crbug.com/467483
-IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, DISABLED_CrossProcess) {
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, CrossProcess) {
   ASSERT_TRUE(StartEmbeddedTestServer());
 
   LoadExtension(test_data_dir_.AppendASCII("webnavigation").AppendASCII("app"));