Revert 174880 due to compilation error in pdf_browsertest.cc

chrome/browser/popup_blocker_browsertest.cc

Index: chrome/browser/popup_blocker_browsertest.cc
===================================================================
--- chrome/browser/popup_blocker_browsertest.cc	(revision 174946)
+++ chrome/browser/popup_blocker_browsertest.cc	(working copy)
@@ -54,7 +54,7 @@
     // 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(), "", ""));
+    CHECK(content::ExecuteJavaScript(tab->GetRenderViewHost(), L"", L""));
     BlockedContentTabHelper* blocked_content_tab_helper =
         BlockedContentTabHelper::FromWebContents(tab);
     std::vector<WebContents*> blocked_contents;