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- make them both use .theme-twisty to show an arrow icon. - move some specifics stylings of SourcesTree to the base class. - make SourcesTree use the arrow React component provided by Tree class. - use .theme-twisty instead of .arrow (which already implements rotation and colors on expand). But it uses "open" instead of "expanded" classname. (VirtualizedTree was already using theme-twisty) This impacts the Source Tree, ObjectInspector (console, debugger), Watch Expressions, memory panel (dominator view). Differential Revision: https://phabricator.services.mozilla.com/D215637