[Extensions] Quick spelling change to an apitest.

Bug: None
Change-Id: I1e4624e218e4bd4b63c245586012fc5ea4d7a7e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359636Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Solomon Kinard <solomonkinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798929}

chrome/browser/extensions/extension_incognito_apitest.cc

@@ -87,7 +87,7 @@ IN_PROC_BROWSER_TEST_F(IncognitoApiTest, IncognitoYesScript) {
 }
 
 // Tests that an extension which is enabled for incognito mode doesn't
-// accidentally create and incognito profile.
+// accidentally create an incognito profile.
 IN_PROC_BROWSER_TEST_F(IncognitoApiTest, DontCreateIncognitoProfile) {
   ASSERT_FALSE(browser()->profile()->HasPrimaryOTRProfile());
   ASSERT_TRUE(RunExtensionTestIncognito(