Un-inline KURL's default constructor to avoid bloating

Source/platform/weborigin/KURL.cpp

Index: Source/platform/weborigin/KURL.cpp
diff --git a/Source/platform/weborigin/KURL.cpp b/Source/platform/weborigin/KURL.cpp
index ffb63dd0cd958fa762e182ada2e0697e020f91db..3c7917f500a6cb0a4522b84b9828ad5f3b6560e5 100644
--- a/Source/platform/weborigin/KURL.cpp
+++ b/Source/platform/weborigin/KURL.cpp
@@ -176,6 +176,12 @@ String KURL::elidedString() const
     return string().left(511) + "..." + string().right(510);
 }
 
+KURL::KURL()
+    : m_isValid(false)
+    , m_protocolIsInHTTPFamily(false)
+{
+}
+
 // Initializes with a string representing an absolute URL. No encoding
 // information is specified. This generally happens when a KURL is converted
 // to a string and then converted back. In this case, the URL is already