[5/N] Add DIR_METADATA files to directories under //chrome/browser

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

Bug: 1113033
Change-Id: I2e1e836754e9485a6949a5d066148571b847155f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577858
Reviewed-by: Scott Violet <[email protected]>
Commit-Queue: Gavin Mak <[email protected]>
Cr-Commit-Position: refs/heads/master@{#834797}
diff --git a/chrome/browser/tabmodel/DIR_METADATA b/chrome/browser/tabmodel/DIR_METADATA
new file mode 100644
index 0000000..875946bb
--- /dev/null
+++ b/chrome/browser/tabmodel/DIR_METADATA
@@ -0,0 +1,5 @@
+monorail:  {
+  component:  "UI>Browser>Mobile>TabModel"
+}
+team_email:  "[email protected]"
+os:  ANDROID