Web Inspector: move PopoverContentHelper from TimelinePresentationModel.js to Popover.js.
https://bugs.webkit.org/show_bug.cgi?id=111431

Reviewed by Yury Semikhatsky.

class WebInspector.TimelinePresentationModel.PopoverContentHelper was renamed to WebInspector.PopoverContentHelper.
Style names were changed accordingly.

* inspector/front-end/Popover.js:
(WebInspector.PopoverContentHelper):
(WebInspector.PopoverContentHelper.prototype.contentTable):
(WebInspector.PopoverContentHelper.prototype._createCell):
(WebInspector.PopoverContentHelper.prototype.appendTextRow):
(WebInspector.PopoverContentHelper.prototype.appendElementRow):
(WebInspector.PopoverContentHelper.prototype.appendStackTrace):
* inspector/front-end/TimelinePresentationModel.js:
(WebInspector.TimelinePresentationModel.prototype.generateMainThreadBarPopupContent):
(WebInspector.TimelinePresentationModel.Record.prototype._generatePopupContentWithImagePreview):
(WebInspector.TimelinePresentationModel.generatePopupContentForFrame):
(WebInspector.TimelinePresentationModel.generatePopupContentForFrameStatistics):
* inspector/front-end/popover.css:
(.popover-details):
(.popover-function-name):
(.popover-stacktrace-title):
(.popover-details-row-title):
(.popover-details-row-data):
(.popover-details-title):
* inspector/front-end/timelinePanel.css:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144759 268f45cc-cd09-0410-ab3c-d52691b4dbfc