Revert of Remove WebSettings::setDisallowFullscreenForNonMediaElements(bool)

Source/web/WebSettingsImpl.h

Index: Source/web/WebSettingsImpl.h
diff --git a/Source/web/WebSettingsImpl.h b/Source/web/WebSettingsImpl.h
index 6838c9e1d866ebd72f3c0a72d51eeafee7e03726..56276a111ea1e2690efc25455a48460c906d96c0 100644
--- a/Source/web/WebSettingsImpl.h
+++ b/Source/web/WebSettingsImpl.h
@@ -89,6 +89,7 @@
     virtual void setDeviceScaleAdjustment(float) OVERRIDE;
     virtual void setDeviceSupportsMouse(bool) OVERRIDE;
     virtual void setDeviceSupportsTouch(bool) OVERRIDE;
+    virtual void setDisallowFullscreenForNonMediaElements(bool) OVERRIDE;
     virtual void setDoubleTapToZoomEnabled(bool) OVERRIDE;
     virtual void setDownloadableBinaryFontsEnabled(bool) OVERRIDE;
     virtual void setEditingBehavior(EditingBehavior) OVERRIDE;
@@ -175,6 +176,7 @@
     bool showPaintRects() const { return m_showPaintRects; }
     bool renderVSyncNotificationEnabled() const { return m_renderVSyncNotificationEnabled; }
     bool autoZoomFocusedNodeToLegibleScale() const { return m_autoZoomFocusedNodeToLegibleScale; }
+    bool disallowFullscreenForNonMediaElements() const { return m_disallowFullscreenForNonMediaElements; }
     bool doubleTapToZoomEnabled() const { return m_doubleTapToZoomEnabled; }
     bool perTilePaintingEnabled() const { return m_perTilePaintingEnabled; }
     bool supportDeprecatedTargetDensityDPI() const { return m_supportDeprecatedTargetDensityDPI; }
@@ -209,6 +211,7 @@
     // can be removed any time after 2015. See http://crbug.com/313754.
     bool m_clobberUserAgentInitialScaleQuirk;
     bool m_mainFrameResizesAreOrientationChanges;
+    bool m_disallowFullscreenForNonMediaElements;
 };
 
 } // namespace blink