Add DIR_METADATA files to //components/pdf...

Generate DIR_METADATA files and remove metadata from OWNERS files for
//components/pdf...

Bug: 1113033
Change-Id: Ia0545364052f110429122f80cd1d9275d05a7c8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545482Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Norman Rosas <normando@google.com>
Cr-Commit-Position: refs/heads/master@{#828722}

components/pdf/DIR_METADATA

+monorail {
+  component: "Internals>Plugins>PDF"
+}
\ No newline at end of file

components/pdf/OWNERS

-file://pdf/OWNERS
-# COMPONENT: Internals>Plugins>PDF
+file://pdf/OWNERS
\ No newline at end of file

components/pdf/renderer/DIR_METADATA

+monorail {
+  component: "Internals>Plugins>PDF"
+}
\ No newline at end of file

components/pdf/renderer/OWNERS

 per-file pdf_accessibility_tree*=dmazzoni@chromium.org
 per-file pepper_pdf_host.*=bbudge@chromium.org
 per-file pepper_pdf_host.*=raymes@chromium.org
-
-# COMPONENT: Internals>Plugins>PDF

components/pdf_strings_grdp/DIR_METADATA

+monorail {
+  component: "Internals>Plugins>PDF"
+}
\ No newline at end of file

components/pdf_strings_grdp/OWNERS

 file://pdf/OWNERS
-
-# COMPONENT: Internals>Plugins>PDF