Reviewed by Pavel Feldman.

        Web Inspector: do not issue frontendReused for reload or navigation.
        https://bugs.webkit.org/show_bug.cgi?id=61192

       - only issue frontendReused when inspector is attached after main resource committed load
       - upon committing loading main resource, reset agents before sending FrameNavigated to page agent
       - Ensure main resource is set early so that abbreviations of URLs in resource tree are consistent after reload
       - do not enable agents explicitly in frontendReused (this is done by backend when resotring state from cookie)

        * inspector/InspectorAgent.cpp:
        (WebCore::InspectorAgent::InspectorAgent):
        (WebCore::InspectorAgent::restore):
        (WebCore::InspectorAgent::clearFrontend):
        (WebCore::InspectorAgent::didCommitLoad):
        * inspector/InspectorAgent.h:
        * inspector/InspectorInstrumentation.cpp:
        (WebCore::InspectorInstrumentation::didCommitLoadImpl):
        * inspector/front-end/NetworkManager.js:
        * inspector/front-end/ResourceTreeModel.js:
        (WebInspector.ResourceTreeModel.prototype._processCachedResources):
        (WebInspector.ResourceTreeModel.prototype._frameNavigated):
        (WebInspector.ResourceTreeModel.prototype._cleanupFramesAfterNavigation):
        (WebInspector.ResourceTreeModel.prototype._addFramesRecursively):
        * inspector/front-end/ResourcesPanel.js:
        (WebInspector.ResourcesPanel.prototype.reset):
        (WebInspector.ResourcesPanel.prototype._resetResourcesTree):
        (WebInspector.DatabaseTreeElement.prototype.onpopulate):
        (WebInspector.SearchResultsTreeElementsTraverser.prototype._lastTreeElement):
        * inspector/front-end/inspector.js:
        (WebInspector.reset):
        (WebInspector.frontendReused):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@87681 268f45cc-cd09-0410-ab3c-d52691b4dbfc