[build] Add DIR_METADATA files.

Generate DIR_METADATA files
and remove metadata from OWNERS files
for //build.

Bug: 1113033
Change-Id: I9cf7592a3247c2a25990768644f7a699f2dac80c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438475Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Norman Rosas <normando@google.com>
Cr-Commit-Position: refs/heads/master@{#812202}

build/DIR_METADATA

+monorail {
+  component: "Build"
+}
+
+team_email: "build@chromium.org"

build/OWNERS

@@ -20,6 +20,3 @@ per-file whitespace_file.txt=*
 per-file OWNERS.status=*
 per-file OWNERS.setnoparent=set noparent
 per-file OWNERS.setnoparent=file://ENG_REVIEW_OWNERS
-
-# TEAM: build@chromium.org
-# COMPONENT: Build

build/android/DIR_METADATA

+os: ANDROID

build/android/OWNERS

@@ -4,5 +4,3 @@ pasko@chromium.org
 skyostil@chromium.org
 tiborg@chromium.org
 wnwen@chromium.org
-
-# OS: Android

build/config/fuchsia/DIR_METADATA

+monorail {
+  component: "Fuchsia"
+}
+
+team_email: "cr-fuchsia@chromium.org"
+
+os: FUCHSIA

build/config/fuchsia/OWNERS

@@ -2,7 +2,3 @@ file://build/fuchsia/OWNERS
 
 per-file *.cmx=set noparent
 per-file *.cmx=file://fuchsia/SECURITY_OWNERS
-
-# COMPONENT: Fuchsia
-# OS: Fuchsia
-# TEAM: cr-fuchsia@chromium.org

build/fuchsia/DIR_METADATA

+monorail {
+  component: "Fuchsia"
+}
+
+team_email: "cr-fuchsia@chromium.org"

build/fuchsia/OWNERS

@@ -3,6 +3,3 @@ fdegans@chromium.org
 kmarshall@chromium.org
 sergeyu@chromium.org
 wez@chromium.org
-
-# TEAM: cr-fuchsia@chromium.org
-# COMPONENT: Fuchsia

build/linux/libncursesw/DIR_METADATA

+monorail {
+  component: "Internals>Accessibility"
+}
+
+team_email: "chromium-accessibility@chromium.org"

build/linux/libncursesw/OWNERS

 file://ui/accessibility/OWNERS
-
-# TEAM: chromium-accessibility@chromium.org
-# COMPONENT: Internals>Accessibility

build/toolchain/fuchsia/DIR_METADATA

+monorail {
+  component: "Fuchsia"
+}
+
+team_email: "cr-fuchsia@chromium.org"
+
+os: FUCHSIA

build/toolchain/fuchsia/OWNERS

 scottmg@chromium.org
-# COMPONENT: Fuchsia
-# OS: Fuchsia
-# TEAM: cr-fuchsia@chromium.org