[2/N] Add DIR_METADATA files to directories under //third_party/

Generate DIR_METADATA files and remove metadata from OWNERS
files for directories under //third_party/.

R=haraken@chromium.org

Bug: 1113033
Change-Id: I2f74cd06d628685f7b9daa7981b86de73f34cb18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572726
Auto-Submit: Gavin Mak <gavinmak@google.com>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833533}

third_party/feed_library/DIR_METADATA

+monorail {
+  component: "UI>Browser>ContentSuggestions>Feed"
+}

third_party/feed_library/OWNERS

 file://components/feed/OWNERS
 
-# Team: feed@chromium.org
-# COMPONENT: UI>Browser>ContentSuggestions>Feed
+# Team: feed@chromium.org
\ No newline at end of file

third_party/fft2d/DIR_METADATA

+monorail {
+  component: "Internals>OptimizationGuide"
+}

third_party/fft2d/OWNERS

 mcrouse@chromium.org
 sophiechang@chromium.org
-tbansal@chromium.org
-# COMPONENT: Internals>OptimizationGuide
+tbansal@chromium.org
\ No newline at end of file

third_party/flatbuffers/DIR_METADATA

+monorail {
+  component: "Platform>Extensions>API"
+}

third_party/flatbuffers/OWNERS

 battre@chromium.org
 csharrison@chromium.org
-engedy@chromium.org
-# COMPONENT: Platform>Extensions>API
+engedy@chromium.org
\ No newline at end of file

third_party/fontconfig/DIR_METADATA

+monorail {
+  component: "Blink>Fonts"
+}

third_party/fontconfig/OWNERS

 spang@chromium.org
 dnicoara@chromium.org
-thomasanderson@chromium.org
-# COMPONENT: Blink>Fonts
+thomasanderson@chromium.org
\ No newline at end of file

third_party/fp16/DIR_METADATA

+monorail {
+  component: "Internals>OptimizationGuide"
+}

third_party/fp16/OWNERS

 mcrouse@chromium.org
 sophiechang@chromium.org
-tbansal@chromium.org
-# COMPONENT: Internals>OptimizationGuide
+tbansal@chromium.org
\ No newline at end of file

third_party/freetype-testing/DIR_METADATA

+monorail {
+  component: "Blink>Fonts"
+}

third_party/freetype-testing/OWNERS

 bungeman@chromium.org
-drott@chromium.org
-# COMPONENT: Blink>Fonts
+drott@chromium.org
\ No newline at end of file

third_party/freetype/DIR_METADATA

+monorail {
+  component: "Blink>Fonts"
+}

third_party/freetype/OWNERS

 bungeman@chromium.org
-drott@chromium.org
-# COMPONENT: Blink>Fonts
+drott@chromium.org
\ No newline at end of file

third_party/fuchsia-sdk/DIR_METADATA

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

third_party/fuchsia-sdk/OWNERS

-file://build/fuchsia/OWNERS
-# COMPONENT: Fuchsia
-# OS: Fuchsia
-# TEAM: cr-fuchsia@chromium.org
+file://build/fuchsia/OWNERS
\ No newline at end of file

third_party/gemmlowp/DIR_METADATA

+monorail {
+  component: "Internals>OptimizationGuide"
+}

third_party/gemmlowp/OWNERS

 mcrouse@chromium.org
 sophiechang@chromium.org
-tbansal@chromium.org
-# COMPONENT: Internals>OptimizationGuide
+tbansal@chromium.org
\ No newline at end of file

third_party/glfw/DIR_METADATA

+monorail {
+  component: "Internals>GPU>Internals"
+}
+team_email: "graphics-dev@chromium.org"

third_party/glfw/OWNERS

 cwallez@chromium.org
 kainino@chromium.org
-
-# COMPONENT: Internals>GPU>Internals
-# TEAM: graphics-dev@chromium.org

third_party/glslang/DIR_METADATA

+monorail {
+  component: "Internals>GPU>Internals"
+}
+team_email: "graphics-dev@chromium.org"

third_party/glslang/OWNERS

 dsinclair@chromium.org
 vmiura@chromium.org
-
-# COMPONENT: Internals>GPU>Internals
-# TEAM: graphics-dev@chromium.org

third_party/google-truth/DIR_METADATA

+monorail {
+  component: "Test>Android"
+}

third_party/google-truth/OWNERS

 fgorski@chromium.org
-
-# COMPONENT: Test>Android