Optimize WebURL -> GURL conversions

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

Index: Source/core/platform/chromium/support/WebURL.cpp
diff --git a/Source/core/platform/chromium/support/WebURL.cpp b/Source/core/platform/chromium/support/WebURL.cpp
index 9d4ed0a608909f38edd1e1a3bfb5dc346a41c60a..93c8366943023bab3429d219920448c366d5c8ee 100644
--- a/Source/core/platform/chromium/support/WebURL.cpp
+++ b/Source/core/platform/chromium/support/WebURL.cpp
@@ -36,7 +36,7 @@
 namespace WebKit {
 
 WebURL::WebURL(const WebCore::KURL& url)
-    : m_spec(url.string().utf8())
+    : m_string(url.string())
     , m_parsed(url.parsed())
     , m_isValid(url.isValid())
 {
@@ -44,7 +44,7 @@ WebURL::WebURL(const WebCore::KURL& url)
 
 WebURL& WebURL::operator=(const WebCore::KURL& url)
 {
-    m_spec = url.string().utf8();
+    m_string = url.string();
     m_parsed = url.parsed();
     m_isValid = url.isValid();
     return *this;
@@ -52,7 +52,7 @@ WebURL& WebURL::operator=(const WebCore::KURL& url)
 
 WebURL::operator WebCore::KURL() const
 {
-    return WebCore::KURL(m_spec, m_parsed, m_isValid);
+    return WebCore::KURL(m_string, m_parsed, m_isValid);
 }
 
 } // namespace WebKit