mojo/common: Decouple GURL dependency

mojo/common/common_type_converters.cc

Index: mojo/common/common_type_converters.cc
diff --git a/mojo/common/common_type_converters.cc b/mojo/common/common_type_converters.cc
index 114b409d7488232a4c4cb39c1859aca7cd0c0823..b656acfc445aac9fb7cef4e1bee8ac88e3d1c097 100644
--- a/mojo/common/common_type_converters.cc
+++ b/mojo/common/common_type_converters.cc
@@ -7,7 +7,6 @@
 #include <string>
 
 #include "base/strings/utf_string_conversions.h"
-#include "url/gurl.h"
 
 namespace mojo {
 
@@ -38,14 +37,6 @@ base::string16 TypeConverter<base::string16, String>::Convert(
   return base::UTF8ToUTF16(input.To<base::StringPiece>());
 }
 
-String TypeConverter<String, GURL>::Convert(const GURL& input) {
-  return String(input.spec());
-}
-
-GURL TypeConverter<GURL, String>::Convert(const String& input) {
-  return GURL(input.get());
-}
-
 std::string TypeConverter<std::string, Array<uint8_t> >::Convert(
     const Array<uint8_t>& input) {
   if (input.is_null())