[gnome-usage] Remove unused code: graph-block and graph-block-row

[Petr Štětka <pstetka src gnome org>]

commit 876a1e317137f085fa85cfa6ec6bb64df60bc694
Author: Petr Štětka <pstetka redhat com>
Date:   Wed Dec 19 14:21:05 2018 +0100

    Remove unused code: graph-block and graph-block-row

 src/graph-block-row.vala |  64 ----------------------------
 src/graph-block.vala     | 107 -----------------------------------------------
 src/meson.build          |   2 -
 3 files changed, 173 deletions(-)
---
diff --git a/src/meson.build b/src/meson.build
index 3a1406b..aea2170 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -8,8 +8,6 @@ vala_sources = [
   'cpu-monitor.vala',
   'cpu-sub-view.vala',
   'gnome-usage.vala',
-  'graph-block-row.vala',
-  'graph-block.vala',
   'graph-box.vala',
   'graph-stacked-renderer.vala',
   'graph-stack-switcher.vala',