Change ExecuteJavaScript* helper functions in browser_test_utils.{h,cc}

content/browser/dom_storage/dom_storage_browsertest.cc

Index: content/browser/dom_storage/dom_storage_browsertest.cc
diff --git a/content/browser/dom_storage/dom_storage_browsertest.cc b/content/browser/dom_storage/dom_storage_browsertest.cc
index 8182475b905215e5f0b459001e71c859c21aef50..84405f2b136dd425f13f219223332bc0df7ce4c8 100644
--- a/content/browser/dom_storage/dom_storage_browsertest.cc
+++ b/content/browser/dom_storage/dom_storage_browsertest.cc
@@ -29,8 +29,10 @@ class DomStorageBrowserTest : public ContentBrowserTest {
     if (result != "pass") {
       std::string js_result;
       ASSERT_TRUE(ExecuteJavaScriptAndExtractString(
-          the_browser->web_contents()->GetRenderViewHost(), L"",
-          L"window.domAutomationController.send(getLog())", &js_result));
+          the_browser->web_contents()->GetRenderViewHost(),
+          std::string(),
+          "window.domAutomationController.send(getLog())",
+          &js_result));
       FAIL() << "Failed: " << js_result;
     }
   }