Add DIR_METADATA files to //ios/web_view

Generate DIR_METADATA files and remove metadata from OWNERS
files for //ios/web_view.

R=jzw@chromium.org

Bug: 1113033
Change-Id: I3c518ead1448caeb41a86814b87b06d18ae2a2ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472480
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817108}

ios/web_view/DIR_METADATA

+# Metadata information for this directory.
+#
+# For more information on DIR_METADATA files, see:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/README.md
+#
+# For the schema of this file, see Metadata message:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/proto/dir_metadata.proto
+
+monorail {
+  component: "Mobile>iOSWebView"
+}
\ No newline at end of file

ios/web_view/OWNERS

@@ -7,5 +7,3 @@ rohitrao@chromium.org
 # These are for the common case of adding or renaming files. If you're doing
 # structural changes, please get a review from an OWNER.
 per-file BUILD.gn=*
-
-# COMPONENT: Mobile>iOSWebView

ios/web_view/internal/autofill/OWNERS

@@ -5,5 +5,3 @@ mahmadi@chromium.org
 # These are for the common case of adding or renaming files. If you're doing
 # structural changes, please get a review from an OWNER.
 per-file BUILD.gn=*
-
-# COMPONENT: Mobile>iOSWebView

ios/web_view/internal/passwords/OWNERS

@@ -5,5 +5,3 @@ vasilii@chromium.org
 # These are for the common case of adding or renaming files. If you're doing
 # structural changes, please get a review from an OWNER.
 per-file BUILD.gn=*
-
-# COMPONENT: Mobile>iOSWebView

ios/web_view/internal/sync/OWNERS

@@ -6,5 +6,3 @@ file://components/sync/OWNERS
 # These are for the common case of adding or renaming files. If you're doing
 # structural changes, please get a review from an OWNER.
 per-file BUILD.gn=*
-
-# COMPONENT: Mobile>iOSWebView

ios/web_view/internal/translate/OWNERS

@@ -4,5 +4,3 @@ jzw@chromium.org
 # These are for the common case of adding or renaming files. If you're doing
 # structural changes, please get a review from an OWNER.
 per-file BUILD.gn=*
-
-# COMPONENT: Mobile>iOSWebView