Componentize ComponentUpdater: Remove erroneous task runner DCHECK in DefaultComponentInstaller.

chrome/browser/component_updater/default_component_installer.cc

Index: chrome/browser/component_updater/default_component_installer.cc
diff --git a/chrome/browser/component_updater/default_component_installer.cc b/chrome/browser/component_updater/default_component_installer.cc
index cca7cbc561617c50fe62ab048191ac82ae54d20a..bc41f9f4ebdda39e96ce9961bc1c22464d534cfe 100644
--- a/chrome/browser/component_updater/default_component_installer.cc
+++ b/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());