Optimize WebURL -> GURL conversions

Source/core/platform/chromium/support/WebString.cpp

Index: Source/core/platform/chromium/support/WebString.cpp
diff --git a/Source/core/platform/chromium/support/WebString.cpp b/Source/core/platform/chromium/support/WebString.cpp
index d110a8c125af30440561d8d7a6b0c1d6b9dc8299..8e3bc1e41742a747a2808b2a333248ade2b8a302 100644
--- a/Source/core/platform/chromium/support/WebString.cpp
+++ b/Source/core/platform/chromium/support/WebString.cpp
@@ -34,6 +34,7 @@
 #include "public/platform/WebCString.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/CString.h"
+#include "wtf/text/StringUTF8Adaptor.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebKit {
@@ -84,6 +85,12 @@ WebCString WebString::utf8() const
     return WTF::String(m_private.get()).utf8();
 }
 
+std::string WebString::toUTF8String() const
+{
+    StringUTF8Adaptor utf8(m_private.get());
+    return std::string(utf8.data(), utf8.length());
+}
+
 WebString WebString::fromUTF8(const char* data, size_t length)
 {
     return WTF::String::fromUTF8(data, length);