Add toStdString methods to CString and WTF::String

third_party/WebKit/Source/wtf/text/WTFString.cpp

Index: third_party/WebKit/Source/wtf/text/WTFString.cpp
diff --git a/third_party/WebKit/Source/wtf/text/WTFString.cpp b/third_party/WebKit/Source/wtf/text/WTFString.cpp
index 6fee9d06de8ce8269a1a0d9ad21a820acf6fc3d9..8532275cbf659e993e553749582202c59b85a98f 100644
--- a/third_party/WebKit/Source/wtf/text/WTFString.cpp
+++ b/third_party/WebKit/Source/wtf/text/WTFString.cpp
@@ -32,6 +32,7 @@
 #include "wtf/dtoa.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/CharacterNames.h"
+#include "wtf/text/StringUTF8Adaptor.h"
 #include "wtf/text/UTF8.h"
 #include "wtf/text/Unicode.h"
 #include <stdarg.h>
@@ -836,6 +837,12 @@ CString String::utf8(UTF8ConversionMode mode) const
     return CString(bufferVector.data(), buffer - bufferVector.data());
 }
 
+std::string String::toUTF8StdString() const
+{
+    StringUTF8Adaptor utf8String = StringUTF8Adaptor(*this);
+    return std::string(utf8String.data(), utf8String.length());
+}
+
 String String::make8BitFrom16BitSource(const UChar* source, size_t length)
 {
     if (!length)