Update OWNERS file now that Chris has left the project.

TBR=sgurun

Review URL: https://codereview.chromium.org/1315443013

Cr-Original-Commit-Position: refs/heads/master@{#348427}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 23eab49ca0ee6393cc4df084ed79201011a19749

OWNERS

@@ -1,4 +1,4 @@
-cjhopman@chromium.org
+agrieve@chromium.org
 dpranke@chromium.org
 jbudorick@chromium.org
 jochen@chromium.org

config/android/OWNERS

@@ -1 +1 @@
-cjhopman@chromium.org
+agrieve@chromium.org