Replace hide-scrollbars flag with a web setting.

third_party/WebKit/Source/core/testing/InternalSettings.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
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 interface InternalSettings : InternalSettingsGenerated {
     // All methods which access Page::settings() can raise an exception
     // when the page cannot be accessed. (Such as during page tear-down.)
     [RaisesException] void setMockScrollbarsEnabled(boolean enabled);
+    [RaisesException] void setHideScrollbars(boolean enabled);
     [RaisesException] void setMockGestureTapHighlightsEnabled(boolean enabled);
     [RaisesException] void setStandardFontFamily(DOMString family, DOMString script);
     [RaisesException] void setSerifFontFamily(DOMString family, DOMString script);
     [RaisesException] void setSansSerifFontFamily(DOMString family, DOMString script);
     [RaisesException] void setFixedFontFamily(DOMString family, DOMString script);
     [RaisesException] void setCursiveFontFamily(DOMString family, DOMString script);
     [RaisesException] void setFantasyFontFamily(DOMString family, DOMString script);
     [RaisesException] void setPictographFontFamily(DOMString family, DOMString script);
     [RaisesException] void setTextAutosizingEnabled(boolean enabled);
     [RaisesException] void setTextAutosizingWindowSizeOverride(long width, long height);
@@ skipping 16 matching lines @@
 
     // FIXME: The following are RuntimeEnabledFeatures and likely
     // cannot be changed after process start.  These setters should
     // be removed or moved onto internals.runtimeFlags:
     void setCSSStickyPositionEnabled(boolean enabled);
     void setLangAttributeAwareFormControlUIEnabled(boolean enabled);
     void setOverlayScrollbarsEnabled(boolean enabled);
     void setExperimentalContentSecurityPolicyFeaturesEnabled(boolean enabled);
     void setScrollTopLeftInteropEnabled(boolean enabled);
 };