[DevTools] Move DevToolsWindow testing code to a separate class.

chrome/browser/ui/cocoa/view_id_util_browsertest.mm

Index: chrome/browser/ui/cocoa/view_id_util_browsertest.mm
diff --git a/chrome/browser/ui/cocoa/view_id_util_browsertest.mm b/chrome/browser/ui/cocoa/view_id_util_browsertest.mm
index 6c5e9a82729885a4555803e4fda826a47ecd8c83..97bfe10f6d20f2f1c1a9691e0c6971f98bb2c231 100644
--- a/chrome/browser/ui/cocoa/view_id_util_browsertest.mm
+++ b/chrome/browser/ui/cocoa/view_id_util_browsertest.mm
@@ -7,7 +7,7 @@
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
-#include "chrome/browser/devtools/devtools_window.h"
+#include "chrome/browser/devtools/devtools_window_testing.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ -47,7 +47,8 @@ class ViewIDTest : public InProcessBrowserTest {
     chrome::ShowFindBar(browser());
 
     // Make sure docked devtools is created to test VIEW_ID_DEV_TOOLS_DOCKED
-    DevToolsWindow::OpenDevToolsWindowForTest(browser(), true);
+    DevToolsWindow* devtools_window =
+        DevToolsWindowTesting::OpenDevToolsWindowSync(browser(), true);
 
     // Make sure download shelf is created to test VIEW_ID_DOWNLOAD_SHELF
     browser()->window()->GetDownloadShelf()->Show();
@@ -82,6 +83,8 @@ class ViewIDTest : public InProcessBrowserTest {
     CheckViewID(VIEW_ID_TAB, true);
     CheckViewID(VIEW_ID_TAB_STRIP, true);
     CheckViewID(VIEW_ID_PREDEFINED_COUNT, false);
+
+    DevToolsWindowTesting::CloseDevToolsWindowSync(devtools_window);
   }
 
  private: