Add myself to third_blink/renderer/modules/OWNER for inspector-related code

Change-Id: I70275386caedc3a1b2bf695b26008006b9fe023f
Reviewed-on: https://chromium-review.googlesource.com/1160939Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580588}

third_party/blink/renderer/modules/OWNERS

@@ -7,6 +7,7 @@ mlamouri@chromium.org
 # Reviewers for inspector-related code:
 dgozman@chromium.org
 pfeldman@chromium.org
+caseq@chromium.org
 
 # TEAM: platform-architecture-dev@chromium.org
 # COMPONENT: Blink>Internals>Modularization