Reland "Add ExecuteJavaScriptForTest and make all tests use it"

chrome/browser/extensions/alert_apitest.cc

Index: chrome/browser/extensions/alert_apitest.cc
diff --git a/chrome/browser/extensions/alert_apitest.cc b/chrome/browser/extensions/alert_apitest.cc
index 9aece0353b4423463cb74a3ae8747582cf5e790a..753f149a0ed868fb6f4987114382467611458969 100644
--- a/chrome/browser/extensions/alert_apitest.cc
+++ b/chrome/browser/extensions/alert_apitest.cc
@@ -21,7 +21,7 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTest, AlertBasic) {
       extensions::ProcessManager::Get(browser()->profile())
           ->GetBackgroundHostForExtension(extension->id());
   ASSERT_TRUE(host);
-  host->host_contents()->GetMainFrame()->ExecuteJavaScript(
+  host->host_contents()->GetMainFrame()->ExecuteJavaScriptForTests(
       base::ASCIIToUTF16("alert('This should not crash.');"));
 
   app_modal::AppModalDialog* alert = ui_test_utils::WaitForAppModalDialog();