Remove myself from non-toplevel owners files

Specifically for base and libplatform I was the only owner. Adding mlippautz@
there.

R=danno@chromium.org

Change-Id: I246b72141abc932d9caf7dcb7485e458283d4a9f
Reviewed-on: https://chromium-review.googlesource.com/551899Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46275}

include/OWNERS

 danno@chromium.org
-jochen@chromium.org
 
 per-file v8-inspector.h=dgozman@chromium.org
 per-file v8-inspector.h=pfeldman@chromium.org

src/base/OWNERS

-jochen@chromium.org
+mlippautz@chromium.org
 
 # COMPONENT: Blink>JavaScript

src/heap/OWNERS

 set noparent
 
 hpayer@chromium.org
-jochen@chromium.org
 mlippautz@chromium.org
 mstarzinger@chromium.org
 ulan@chromium.org

src/inspector/OWNERS

@@ -3,7 +3,6 @@ set noparent
 alph@chromium.org
 caseq@chromium.org
 dgozman@chromium.org
-jochen@chromium.org
 kozyatinskiy@chromium.org
 pfeldman@chromium.org
 yangguo@chromium.org

src/libplatform/OWNERS

-jochen@chromium.org
+mlippautz@chromium.org
 
 # COMPONENT: Blink>JavaScript>API

src/trap-handler/OWNERS

 set noparent
 
-jochen@chromium.org
 bradnelson@chromium.org
 
 # Changes to this directory should also be reviewed by:

third_party/inspector_protocol/OWNERS

@@ -3,7 +3,6 @@ set noparent
 alph@chromium.org
 caseq@chromium.org
 dgozman@chromium.org
-jochen@chromium.org
 kozyatinskiy@chromium.org
 pfeldman@chromium.org
 yangguo@chromium.org