/usr/lib/x86_64-linux-gnu/pkgconfig/webkit-1.0.pc is in libwebkitgtk-dev 2.4.10-0ubuntu0.14.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: WebKit
Description: Web content engine for GTK+
Version: 2.4.10
Requires: glib-2.0 gtk+-2.0 libsoup-2.4 javascriptcoregtk-1.0
Libs: -L${libdir} -lwebkitgtk-1.0
Cflags: -I${includedir}/webkitgtk-1.0
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