Remove docked windows entirely in M59.

ash/common/ash_switches.h

Index: ash/common/ash_switches.h
diff --git a/ash/common/ash_switches.h b/ash/common/ash_switches.h
index cec1df685ff74e1377c686ab5b4c1dd27aeaf0da..da3c44fd6455b439681da75e3be72ba8493b4a18 100644
--- a/ash/common/ash_switches.h
+++ b/ash/common/ash_switches.h
@@ -26,7 +26,6 @@ ASH_EXPORT extern const char kAshDisableScreenOrientationLock[];
 ASH_EXPORT extern const char kAshDisableTouchExplorationMode[];
 ASH_EXPORT extern const char kAshEnableMagnifierKeyScroller[];
 ASH_EXPORT extern const char kAshEnablePaletteOnAllDisplays[];
-ASH_EXPORT extern const char kAshEnableDockedWindows[];
 ASH_EXPORT extern const char kAshEnableTouchView[];
 ASH_EXPORT extern const char kAshEnableMirroredScreen[];
 ASH_EXPORT extern const char kAshForceEnablePalette[];
@@ -44,9 +43,6 @@ ASH_EXPORT extern const char kAuraLegacyPowerButton[];
 // True if the pointer (cursor) position should be kept inside root windows.
 ASH_EXPORT bool ConstrainPointerToRoot();
 
-// True if docking windows right or left is enabled.
-ASH_EXPORT bool DockedWindowsEnabled();
-
 }  // namespace switches
 }  // namespace ash