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Originally, ExtensionUninstallDialog took a Browser argument (which
determined which browser window it should be modal to), and a special
case was added so the dialog would be modal to the app list if the
Browser argument was NULL. Updated this constructor to take the parent
NativeWindow directly instead of a Browser, so the dialog can be modal
to any parent window. For example, this allows it to be parent to the
App Info dialog, and be a proper standalone dialog in
ExtensionStorageMonitor. Further refactors can be made as a result of
this CL since some of the callsites could be getting a Browser just to
be able to launch the dialog, whereas that is not needed anymore if the
intention is to launch it as a non-modal dialog.

Updated uninstall dialogs launched from the following callsites:
- The management Chrome API
- The extensions context menu
- The 'app disabled' message for when it has requested new permissions
- The chrome://extensions page
- The context menu of apps in the app list
- The 'remove' button in the App Info dialog
- The context menu on the New Tab page

BUG=388746,362308

Review URL: https://codereview.chromium.org/382133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285541 0039d316-1c4b-4281-b951-d872f2087c98