Webengine fails to build with GCC 7

As the subject says, compilation fails when using GCC 7:

[ 433s]
/home/abuild/rpmbuild/BUILD/qtwebengine-opensource-src-5.7.1/src/3rdparty/chromium/mojo/public/cpp/bindings/interface_ptr_info.h:
In member function 'mojo::InterfacePtrInfo<Interface>&
mojo::InterfacePtrInfo<Interface>::operator=(mojo::InterfacePtrInfo<Interface>&&)':
[ 433s]
/home/abuild/rpmbuild/BUILD/qtwebengine-opensource-src-5.7.1/src/3rdparty/chromium/mojo/public/cpp/bindings/interface_ptr_info.h:37:31:
error: 'mojo::ScopedMessagePipeHandle

' has no member named 'Pass'
[ 433s] handle_ = other.handle_.Pass();
[ 433s] ^~~~

This was originally reported in openSUSE (http://bugzilla.opensuse.org/show_bug.cgi?id=1031329) and Debian (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=853634).