Use davidmunro@google.com in flag_metadata.json

Bug: None
Test: None
Change-Id: I20a4bf51333de786a2c6bf802bd37511e38fbfc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593788
Auto-Submit: David Munro <davidmunro@google.com>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: David Munro <davidmunro@google.com>
Commit-Queue: Nic Hollingum <hollingum@google.com>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837331}

chrome/browser/flag-metadata.json

@@ -719,12 +719,12 @@
   },
   {
     "name": "crostini-disk-resizing",
-    "owners": [ "davidmunro", "nverne" ],
+    "owners": [ "davidmunro@google.com", "nverne" ],
     "expiry_milestone": 86
   },
   {
     "name": "crostini-enable-dlc",
-    "owners": [ "sidereal", "davidmunro", "nverne" ],
+    "owners": [ "sidereal", "davidmunro@google.com", "nverne" ],
     "expiry_milestone": 92
   },
   {
@@ -734,7 +734,7 @@
   },
   {
     "name": "crostini-reset-lxd-db",
-    "owners": [ "davidmunro", "nverne", "sidereal" ],
+    "owners": [ "davidmunro@google.com", "nverne", "sidereal" ],
     "expiry_milestone": 89
   },
   {
@@ -744,7 +744,7 @@
   },
   {
     "name": "crostini-use-dlc",
-    "owners": [ "sidereal", "davidmunro", "nverne" ],
+    "owners": [ "sidereal", "davidmunro@google.com", "nverne" ],
     "expiry_milestone": 92
   },
   {