Remove docked windows entirely in M59.

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 ed4b4aca606e2de1c6d2dfa905db57f3f41ed737..99f1a6bd3b1266baf32336e82f376cfe208beb74 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5617,12 +5617,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
         <message name="IDS_FLAGS_ASH_SCREEN_ORIENTATION_LOCK_DESCRIPTION" desc="Description for the flag which can be used for support for javascript locking rotation">
           Allows javascript to lock the screen orienation.
         </message>
-        <message name="IDS_FLAGS_ASH_ENABLE_DOCKED_WINDOWS_NAME" desc="Title for the flag which can be used to enable docking windows to right or left.">
-          Enable docked windows.
-        </message>
-        <message name="IDS_FLAGS_ASH_ENABLE_DOCKED_WINDOWS_DESCRIPTION" desc="Description for the flag which can be used to enable docking windows to right or left.">
-          Enable docking windows to the left and right of the screen.
-        </message>
         <message name="IDS_FLAGS_ASH_ENABLE_MIRRORED_SCREEN_NAME" desc="Title for the flag to enable the mirrored screen mode.">
           Enable mirrored screen mode.
         </message>