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

content/public/test/browser_test_utils.h

Index: content/public/test/browser_test_utils.h
diff --git a/content/public/test/browser_test_utils.h b/content/public/test/browser_test_utils.h
index 64817a51f1f77afb76fe7360e7f0cd6f0db27b3d..8f7d3803747cd3cb51c0fb5e97add8f5345ac999 100644
--- a/content/public/test/browser_test_utils.h
+++ b/content/public/test/browser_test_utils.h
@@ -84,8 +84,8 @@ void SimulateKeyPress(WebContents* web_contents,
 // If you want to extract a result, use one of the below functions.
 // Returns true on success.
 bool ExecuteJavaScript(RenderViewHost* render_view_host,
-                       const std::wstring& frame_xpath,
-                       const std::wstring& script) WARN_UNUSED_RESULT;
+                       const std::string& frame_xpath,
+                       const std::string& script) WARN_UNUSED_RESULT;
 
 // The following methods executes the passed |script| in the frame pointed to by
 // |frame_xpath| (use empty string for main frame) and sets |result| to the
@@ -93,17 +93,17 @@ bool ExecuteJavaScript(RenderViewHost* render_view_host,
 // They return true on success, false if the script evaluation failed or did not
 // evaluate to the expected type.
 bool ExecuteJavaScriptAndExtractInt(RenderViewHost* render_view_host,
-                                    const std::wstring& frame_xpath,
-                                    const std::wstring& script,
+                                    const std::string& frame_xpath,
+                                    const std::string& script,
                                     int* result) WARN_UNUSED_RESULT;
 bool ExecuteJavaScriptAndExtractBool(RenderViewHost* render_view_host,
-                                     const std::wstring& frame_xpath,
-                                     const std::wstring& script,
+                                     const std::string& frame_xpath,
+                                     const std::string& script,
                                      bool* result) WARN_UNUSED_RESULT;
 bool ExecuteJavaScriptAndExtractString(
     RenderViewHost* render_view_host,
-    const std::wstring& frame_xpath,
-    const std::wstring& script,
+    const std::string& frame_xpath,
+    const std::string& script,
     std::string* result) WARN_UNUSED_RESULT;
 
 // Returns the cookies for the given url.