Sync: Turn on full history sync 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 274f935212a7a98b1b4f801fde7f2ac00ada1c8b..d18b545e6b0bc3fd8e424c70ca8f6803e85dc7bf 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7041,11 +7041,11 @@ Keep your key file in a safe place. You will need it to create new versions of y
           Enable experimental Bluetooth features.
         </message>
       </if>
-      <message name="IDS_FLAGS_FULL_HISTORY_SYNC_NAME" desc="Name of the flag to enable full history sync.">
-        Enable full history sync.
+      <message name="IDS_FLAGS_FULL_HISTORY_SYNC_NAME" desc="Name of the flag to disable full history sync.">
+        Disable full history sync
       </message>
-      <message name="IDS_FLAGS_FULL_HISTORY_SYNC_DESCRIPTION" desc="Description for the flag to enable full history sync.">
-        If tab sync is enabled, this feature allows you to see and delete history entries from your synced devices at chrome://history.
+      <message name="IDS_FLAGS_FULL_HISTORY_SYNC_DESCRIPTION" desc="Description for the flag to disable full history sync.">
+        Allows you to see and delete history entries from your signed-in devices at chrome://history.
       </message>
       <message name="IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_NAME" desc="Name of the flag to disable accelerated video decode where available.">
         Disable hardware-accelerated video decode.