Remove kOzoneTestSingleOverlaySupport.

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 f9dec2db77a38628b59c52a9fb5e1859f7db4a51..4e384f3090fdf61e4c2f25daadd668947f29b2b9 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6586,14 +6586,6 @@ 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>
       <message name="IDS_FLAGS_DATASAVER_PROMPT_NAME" desc="Title for the flag to enable a prompt to install Data Saver when a cellular network is detected." translateable="false">
         Cellular Data Saver Prompt
       </message>