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

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
diff --git a/chrome/browser/tab_contents/tab_contents.cc b/chrome/browser/tab_contents/tab_contents.cc
index 083296c37f5f1d29a77cb867233181607590e9f9..b6c2cc7bee43a19870e2a93dc8a4cafa2bd0a22a 100644
--- a/chrome/browser/tab_contents/tab_contents.cc
+++ b/chrome/browser/tab_contents/tab_contents.cc
@@ -2008,7 +2008,7 @@ void TabContents::UpdateTitle(RenderViewHost* rvh,
 }
 
 void TabContents::UpdateEncoding(RenderViewHost* render_view_host,
-                                 const std::wstring& encoding) {
+                                 const std::string& encoding) {
   set_encoding(encoding);
 }
 
@@ -2496,7 +2496,7 @@ void TabContents::Observe(NotificationType type,
   }
 }
 
-void TabContents::set_encoding(const std::wstring& encoding) {
+void TabContents::set_encoding(const std::string& encoding) {
   encoding_ = CharacterEncoding::GetCanonicalEncodingNameByAliasName(encoding);
 }