Move PathService's DIR_LAYOUT_TESTS from chrome to content

chrome/test/data/layout_tests/layout_test_controller.html

-<script>
-function LayoutTestController() {
-  this.dump_as_text_ = false;
-  this.wait_until_done_ = false;
-
-  this.dumpAsText = function () {
-    this.dump_as_text_ = true;
-  };
-
-  this.waitUntilDone = function () {
-    this.wait_until_done_ = true;
-  };
-
-  this.notifyDone = function () {
-    // For storage events, it actually takes 2 rounds of yielding for everything
-    // to complete.
-    setTimeout(layoutTestController.DelayedNotifyDone1, 0);
-  };
-
-  this.overridePreference = function () {
-    // WebSocket tests call this function by preference name
-    // 'WebKitHixie76WebSocketProtocolEnabled' to switch its protocol version.
-    // In Chromium, the value must be 0 because it doesn't support old one.
-  };
-
-  this.DelayedNotifyDone1 = function () {
-    setTimeout(layoutTestController.DelayedNotifyDone2, 0);
-  };
-
-  this.DelayedNotifyDone2 = function () {
-    var token = encodeURIComponent(document.body.innerText);
-    var limit = 4090;
-    if (token.length > limit)
-      token = encodeURIComponent("Too Big! encoded innerText size was " +
-          token.length + " > " + limit);
-    document.cookie = "%COOKIE%=" + token;
-  };
-
-  this.OnEvent = function () {
-    // HACK: dumpAsText() is always called after waitUntilDone() and all tests
-    //       that are run within the UI test framework either call
-    //       waitUntilDone() or dumpAsText().  So we'll simply keep polling
-    //       until we see one or the other.
-    if (layoutTestController.dump_as_text_) {
-      if (!layoutTestController.wait_until_done_)
-        layoutTestController.notifyDone();
-    } else {
-      setTimeout(layoutTestController.OnEvent, 200);
-    }
-  };
-}
-
-window.layoutTestController = new LayoutTestController();
-window.addEventListener('load', layoutTestController.OnEvent, false);
-</script>