Web Inspector: rename TimelineOverviewWindow to OverviewGrid.Window and fix names for constants.
https://bugs.webkit.org/show_bug.cgi?id=112685

Reviewed by Yury Semikhatsky.

It is the second patch which extracts OverviewGrid from TimelineOverviewPane.
It renames internal components of OverviewGrid.
WebInspector.TimelineOverviewWindow -> WebInspector.OverviewGrid.Window
WebInspector.TimelineOverviewWindow.WindowSelector -> WebInspector.OverviewGrid.WindowSelector

and moves constants from WebInspector.TimelineOverviewWindow namespace to WebInspector.OverviewGrid namespace

* inspector/front-end/TimelineOverviewPane.js:
(WebInspector.TimelineOverviewPane):
(WebInspector.OverviewGrid):
(WebInspector.OverviewGrid.Window):
(WebInspector.OverviewGrid.Window.prototype._startWindowSelectorDragging):
(WebInspector.OverviewGrid.Window.prototype._endWindowSelectorDragging):
(WebInspector.OverviewGrid.Window.prototype._startWindowDragging):
(WebInspector.OverviewGrid.Window.prototype._windowDragging):
(WebInspector.OverviewGrid.Window.prototype._moveWindow):
(WebInspector.OverviewGrid.Window.prototype._resizeWindowRight):
(WebInspector.OverviewGrid.Window.prototype._setWindowPosition):
(WebInspector.OverviewGrid.Window.prototype._onMouseWheel):
(WebInspector.OverviewGrid.Window.prototype._zoom):
(WebInspector.OverviewGrid.WindowSelector):
(WebInspector.OverviewGrid.WindowSelector.prototype._createSelectorElement):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146200 268f45cc-cd09-0410-ab3c-d52691b4dbfc