Unrevert: Show the install dialog for the initial load of an unpacked extension
with plugins.

First landing broke some browser tests.

BUG=83273
TEST=in the extensions managmenet page, with developer mode enabled, Load an unpacked extension on an extension with NPAPI plugins. You should get an install dialog.
TBR=mihaip

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@87738 0039d316-1c4b-4281-b951-d872f2087c98
void ExtensionServiceBackend::ReportExtensionLoadError(
    const FilePath& extension_path, const std::string &error) {
  CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  if (frontend_.get())
    frontend_->ReportExtensionLoadError(
        extension_path, error, NotificationType::EXTENSION_INSTALL_ERROR,
         true /* alert_on_error */);
 }

void ExtensionServiceBackend::ReportExtensionLoadError(
    const FilePath& extension_path, const std::string &error) {
  CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  if (frontend_.get())
    frontend_->ReportExtensionLoadError(
        extension_path, error, NotificationType::EXTENSION_INSTALL_ERROR,
         true /* alert_on_error */);
 }
