Convert std::wstring encoding names to std::string in a bunch of files.

chrome/test/automation/tab_proxy.h

Index: chrome/test/automation/tab_proxy.h
diff --git a/chrome/test/automation/tab_proxy.h b/chrome/test/automation/tab_proxy.h
index c8bb83e954f185e82abd8fefe12b9a78800afe98..e8dbe492b3eef60570a08173af00513b2868c676 100644
--- a/chrome/test/automation/tab_proxy.h
+++ b/chrome/test/automation/tab_proxy.h
@@ -304,10 +304,10 @@ class TabProxy : public AutomationResourceProxy {
   bool WaitForNavigation(int64 last_navigation_time);
 
   // Gets the current used encoding of the page in the tab.
-  bool GetPageCurrentEncoding(std::wstring* encoding);
+  bool GetPageCurrentEncoding(std::string* encoding);
 
   // Uses the specified encoding to override encoding of the page in the tab.
-  bool OverrideEncoding(const std::wstring& encoding);
+  bool OverrideEncoding(const std::string& encoding);
 
 #if defined(OS_WIN)
   // Resizes the tab window.