Terminated extensions should be uninstalled without error now.

For extensions that have been terminated, attempts to uninstall them via the chrome.management.uninstall call
caused an "Extension not found" error because such extensions weren't included in the search.

R=rockot@chromium.org
BUG=412252

Review URL: https://codereview.chromium.org/556723003

Cr-Commit-Position: refs/heads/master@{#293906}

chrome/browser/extensions/api/management/management_api.cc

@@ -599,7 +599,8 @@ bool ManagementUninstallFunctionBase::Uninstall(
     bool show_confirm_dialog) {
   extension_id_ = target_extension_id;
   const Extension* target_extension =
-      service()->GetExtensionById(extension_id_, true);
+      extensions::ExtensionRegistry::Get(browser_context())->
+          GetExtensionById(extension_id_, ExtensionRegistry::EVERYTHING);
   if (!target_extension ||
       ui_util::ShouldNotBeVisible(target_extension, browser_context())) {
     error_ = ErrorUtils::FormatErrorMessage(