[6/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: I41aaff2325f62e1fe622c2d741307b10015ae8bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576115
Reviewed-by: Scott Violet <[email protected]>
Commit-Queue: Gavin Mak <[email protected]>
Cr-Commit-Position: refs/heads/master@{#834779}
diff --git a/chrome/browser/sessions/DIR_METADATA b/chrome/browser/sessions/DIR_METADATA
new file mode 100644
index 0000000..80992c1
--- /dev/null
+++ b/chrome/browser/sessions/DIR_METADATA
@@ -0,0 +1,3 @@
+monorail:  {
+  component:  "UI>Browser>Sessions"
+}