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

chrome/browser/popup_blocker_browsertest.cc

Index: chrome/browser/popup_blocker_browsertest.cc
diff --git a/chrome/browser/popup_blocker_browsertest.cc b/chrome/browser/popup_blocker_browsertest.cc
index 4dba5ef44775a9cc0028bfe00f42e2b0b536ad54..8b931b50bd7819cf88035452c0ab9a9dc7f89cf9 100644
--- a/chrome/browser/popup_blocker_browsertest.cc
+++ b/chrome/browser/popup_blocker_browsertest.cc
@@ -54,7 +54,7 @@ class PopupBlockerBrowserTest : public InProcessBrowserTest {
     // Do a round trip to the renderer first to flush any in-flight IPCs to
     // create a to-be-blocked window.
     WebContents* tab = chrome::GetActiveWebContents(browser);
-    CHECK(content::ExecuteJavaScript(tab->GetRenderViewHost(), L"", L""));
+    CHECK(content::ExecuteJavaScript(tab->GetRenderViewHost(), "", ""));
     BlockedContentTabHelper* blocked_content_tab_helper =
         BlockedContentTabHelper::FromWebContents(tab);
     std::vector<WebContents*> blocked_contents;