Add DIR_METADATA files to //components/page_load_metrics

Generate DIR_METADATA files and remove metadata from OWNERS files for
//components/page_load_metrics

Bug: 1113033
Change-Id: I93641d807e66e984f62d63e9c7522e1fefe70169
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545262Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Commit-Queue: Norman Rosas <normando@google.com>
Cr-Commit-Position: refs/heads/master@{#828379}

components/page_load_metrics/DIR_METADATA

+monorail {
+  component: "Speed>Metrics"
+}
\ No newline at end of file

components/page_load_metrics/OWNERS

@@ -14,5 +14,3 @@ johnidel@chromium.org
 # For straightforward addition/removal to existing observers only (for
 # APAC).
 kinuko@chromium.org
-
-# COMPONENT: Speed>Metrics

components/page_load_metrics/browser/DIR_METADATA

+monorail {
+  component: "Speed>Metrics"
+}
\ No newline at end of file

components/page_load_metrics/browser/OWNERS

 # For QUIC version changes in ConnectionInfo switch statmenets.
-per-file protocol_util.cc=file://net/quic/OWNERS
-# COMPONENT: Speed>Metrics
+per-file protocol_util.cc=file://net/quic/OWNERS
\ No newline at end of file

components/page_load_metrics/browser/observers/core/DIR_METADATA

+monorail {
+  component: "Speed>Metrics"
+}
\ No newline at end of file

components/page_load_metrics/browser/observers/core/OWNERS

@@ -2,5 +2,3 @@ bmcquade@chromium.org
 npm@chromium.org
 skobes@chromium.org
 sullivan@chromium.org
-
-# COMPONENT: Speed>Metrics