Switch owners for chrome/browser/resources/pdf

This Cl switches chrome/browser/resources/pdf OWNERS to list myself and
remove raymes@.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2857163002
Cr-Commit-Position: refs/heads/master@{#469321}

chrome/browser/resources/pdf/OWNERS

-raymes@chromium.org
+dsinclair@chromium.org
 
 # COMPONENT: Internals>Plugins>PDF