Componentize ComponentUpdater: Remove erroneous task runner DCHECK in DefaultComponentInstaller.

Removes an erroneous DCHECK added in this patch: https://codereview.chromium.org/385013002/

This DCHECK is erroneous, because the Install() function in DefaultComponentInstaller is actually called on a different task runner than the member task runner.

It's called from ComponentUnpacker::Install. ComponentUnpacker has a different task runner with a different sequence token, so it's erroneous to DCHECK it against the member task runner of DefaultComponentInstaller.

BUG=397264

Review URL: https://codereview.chromium.org/419103002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285526 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/component_updater/default_component_installer.cc

@@ -74,8 +74,6 @@ bool DefaultComponentInstaller::InstallHelper(
 
 bool DefaultComponentInstaller::Install(const base::DictionaryValue& manifest,
                                         const base::FilePath& unpack_path) {
-  DCHECK(task_runner_);
-  DCHECK(task_runner_->RunsTasksOnCurrentThread());
   std::string manifest_version;
   manifest.GetStringASCII("version", &manifest_version);
   base::Version version(manifest_version.c_str());