Have the Debugger extension api check that it has access to the tab

Check PermissionsData::CanAccessTab() prior to attaching the debugger.

BUG=367567

Review URL: https://codereview.chromium.org/352523003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280354 0039d316-1c4b-4281-b951-d872f2087c98
void ExtensionDevToolsClientHost::OnExtensionUnloaded(
    content::BrowserContext* browser_context,
    const Extension* extension,
    UnloadedExtensionInfo::Reason reason) {
  if (extension->id() == extension_id_)
    Close();
}

void ExtensionDevToolsClientHost::OnExtensionUnloaded(
    content::BrowserContext* browser_context,
    const Extension* extension,
    UnloadedExtensionInfo::Reason reason) {
  if (extension->id() == extension_id_)
    Close();
}
