build: Allow glib to be disabled for non-ozone builds of chromium when using GN.
build: Allow glib to be disabled for non-ozone builds of chromium when using GN.

gyp allows glib to be disabled using -Duse_glib=0. This allows glib
to also be disabled when using GN.

BUG=
TEST=gn args out/Default; use_glib = false; Build and run.

Review URL: https://codereview.chromium.org/1415153007

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#358188}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk