Delete/move the remaining stale tests in TestExpectations.

LayoutTests/http/tests/navigation/back-twice-without-commit.html

Index: LayoutTests/http/tests/navigation/back-twice-without-commit.html
diff --git a/LayoutTests/http/tests/navigation/back-twice-without-commit.html b/LayoutTests/http/tests/navigation/back-twice-without-commit.html
deleted file mode 100644
index bda5ebd9d92ed5dc26d0a0eecc625cf5237667c4..0000000000000000000000000000000000000000
--- a/LayoutTests/http/tests/navigation/back-twice-without-commit.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<script>
-if (window.testRunner) {
-    if (!window.localStorage.page1Started) {
-        // On the first visit, clear the back forward list to start fresh,
-        // then set up the test.
-        window.localStorage.page1Started = true;
-        testRunner.clearBackForwardList();
-        testRunner.dumpBackForwardList();
-        testRunner.dumpAsText();
-
-        // Visit two pages, then go back to page 2, which has a slow frame the 
-        // second time, and then back to page 1 before page 2 commits.
-        testRunner.queueLoad("resources/back-twice-page-2.html");
-        testRunner.queueLoad("resources/back-twice-page-3.html");
-        testRunner.queueBackNavigation(1);
-        testRunner.queueBackNavigation(1);
-    } else {
-        delete window.localStorage.page1Started;
-    }
-}
-</script>
-<p>This test checks that going back twice without committing doesn't corrupt the back/forward list.
-<p>If testing manually, <a href="resources/back-twice-page-2.html">click here</a>.