Revert "[ozone] Add an about flag to enable ozone overlay testing."

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 3754a931538344136a2b07ace863e7e9b2855b94..1ade4bac952047f8574c053115d9c899938c8ae8 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6886,14 +6886,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_SYNC_SANDBOX_DESCRIPTION" desc="Description for the flag that causes Chrome to use the sandbox (testing) server for Sync.">
         Connects to the testing server for Chrome Sync.
       </message>
-      <if expr="chromeos">
-        <message name="IDS_FLAGS_OZONE_TEST_SINGLE_HARDWARE_OVERLAY" desc="Name of the 'Ozone hardware overlay' lab.">
-          Ozone hardware overlay
-        </message>
-        <message name="IDS_FLAGS_OZONE_TEST_SINGLE_HARDWARE_OVERLAY_DESCRIPTION" desc="Description of the 'Ozone hardware overlay' lab.">
-          Enables compositing with an addition of one hardware overlay when possible.
-        </message>
-      </if>
 
       <!-- Crashes -->
       <message name="IDS_CRASHES_TITLE" desc="Title for the chrome://crashes page.">