Remove UTF string conversion functions from the global namespace.

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index e836092e76657df2e66349b624441a399cf7c0cc..e1305f1c2d1fb323d2276ae6491e4060724a2ca1 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -494,7 +494,7 @@ void DisplayDebugMessageInDialog(const std::string& str) {
     backslash[1] = 0;
   wcscat_s(prog_name, MAX_PATH, L"debug_message.exe");
 
-  std::wstring cmdline = UTF8ToWide(str);
+  std::wstring cmdline = base::UTF8ToWide(str);
   if (cmdline.empty())
     return;
 
@@ -862,5 +862,5 @@ std::wstring GetLogFileFullPath() {
 }  // namespace logging
 
 std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
-  return out << WideToUTF8(std::wstring(wstr));
+  return out << base::WideToUTF8(std::wstring(wstr));
 }