Reverse the embedded-shared-worker flag to turn the feature on by default.

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 5a7830bf2c9ac7911c6dbdf2aa5e24aa00aed7a2..f870572fd545a8d4a820bce76462c90277954707 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6790,11 +6790,11 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_ENABLE_EASY_UNLOCK_DESCRIPTION" desc="Description for flag to Enable Easy Unlock.">
         Easy Unlock allows you to unlock your Chromebook when in proximity to your phone.
       </message>
-      <message name="IDS_FLAGS_ENABLE_EMBEDDED_SHARED_WORKER_NAME" desc="Name for In-renderer Shared Worker.">
-        In-renderer Shared Worker.
+      <message name="IDS_FLAGS_DISABLE_EMBEDDED_SHARED_WORKER_NAME" desc="Name of the flag to disable In-renderer Shared Worker.">
+        Disable In-renderer Shared Worker.
       </message>
-      <message name="IDS_FLAGS_ENABLE_EMBEDDED_SHARED_WORKER_DESCRIPTION" desc="Description for flag to In-renderer Shared Worker.">
-        Run Shared Worker in a renderer process.
+      <message name="IDS_FLAGS_DISABLE_EMBEDDED_SHARED_WORKER_DESCRIPTION" desc="Description of the flag to disable In-renderer Shared Worker.">
+        Disable In-Renderer Shared Worker to run Shared Worker in a legacy dedicated worker process.
       </message>
 
       <!-- Crashes -->