Revert 174880 due to compilation error in pdf_browsertest.cc

chrome/browser/do_not_track_browsertest.cc

Index: chrome/browser/do_not_track_browsertest.cc
===================================================================
--- chrome/browser/do_not_track_browsertest.cc	(revision 174946)
+++ chrome/browser/do_not_track_browsertest.cc	(working copy)
@@ -67,8 +67,8 @@
   std::string do_not_track;
   EXPECT_TRUE(content::ExecuteJavaScriptAndExtractString(
       chrome::GetActiveWebContents(browser())->GetRenderViewHost(),
-      "",
-      "window.domAutomationController.send(navigator.doNotTrack)",
+      std::wstring(),
+      L"window.domAutomationController.send(navigator.doNotTrack)",
       &do_not_track));
   EXPECT_EQ("1", do_not_track);
 
@@ -78,9 +78,9 @@
 
   EXPECT_TRUE(content::ExecuteJavaScriptAndExtractString(
       chrome::GetActiveWebContents(browser())->GetRenderViewHost(),
-      "",
-      "window.domAutomationController.send("
-      "    navigator.doNotTrack === null ? '0' : '1')",
+      std::wstring(),
+      L"window.domAutomationController.send("
+      L"navigator.doNotTrack === null ? '0' : '1')",
       &do_not_track));
   EXPECT_EQ("0", do_not_track);
 }