Revert "[reland] Cros splitscreen: Disable splitscreen on M66 stable channel."

The CL has been merged back to M66. So revert this CL on tot.
This reverts commit cf5e5473412073d5d52476c456eed66386483e58.

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Bug: 827322
Change-Id: I9d5ca5abf7399318e5bf950c5e25d01bc2ff9093
Reviewed-on: https://chromium-review.googlesource.com/1005615
Reviewed-by: Xiaoqian Dai <[email protected]>
Commit-Queue: Xiaoqian Dai <[email protected]>
Cr-Commit-Position: refs/heads/master@{#549640}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index a70e42ad..2cf2f8c7 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1629,6 +1629,9 @@
 extern const char kDisableTabletAutohideTitlebarsName[];
 extern const char kDisableTabletAutohideTitlebarsDescription[];
 
+extern const char kDisableTabletSplitViewName[];
+extern const char kDisableTabletSplitViewDescription[];
+
 extern const char kEnablePerUserTimezoneName[];
 extern const char kEnablePerUserTimezoneDescription[];
 
@@ -1662,9 +1665,6 @@
 extern const char kEnableFullscreenHandwritingVirtualKeyboardName[];
 extern const char kEnableFullscreenHandwritingVirtualKeyboardDescription[];
 
-extern const char kEnableTabletSplitViewName[];
-extern const char kEnableTabletSplitViewDescription[];
-
 extern const char kEnableUnifiedMultiDeviceSettingsName[];
 extern const char kEnableUnifiedMultiDeviceSettingsDescription[];