MD Settings cleanup: Removing unnecessary workaround for multpile hosts.

This is a remainder from removing md-settings as a valid host.

Bug: None
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1f5a910859b83f9330522b4a9270c6c1bd1627d6
Reviewed-on: https://chromium-review.googlesource.com/699750Reviewed-by: Dan Beam (no longer on Chrome) <dbeam@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506572}

chrome/browser/resources/settings/BUILD.gn

@@ -15,7 +15,7 @@ optimize_webui("build") {
     "vulcanized.html",
     "lazy_load.vulcanized.html",
   ]
-  insert_in_head = "<base href=\"chrome://\$i18n{hostname}\">"
+  insert_in_head = "<base href=\"chrome://settings\">"
   input = rebase_path("$target_gen_dir/$unpak_folder", root_build_dir)
   js_out_files = [
     "crisper.js",

chrome/browser/resources/settings/settings.html

@@ -4,7 +4,7 @@
   <meta charset="utf-8">
   <title>$i18n{settings}</title>
 <if expr="not optimize_webui">
-  <base href="chrome://$i18n{hostname}">
+  <base href="chrome://settings">
 </if>
   <style>
     html {

chrome/browser/ui/webui/settings/md_settings_ui.cc

@@ -189,9 +189,6 @@ MdSettingsUI::MdSettingsUI(content::WebUI* web_ui)
 
   content::WebUIDataSource* html_source =
       content::WebUIDataSource::Create(chrome::kChromeUISettingsHost);
-  // This is used by a <base> tag in c/b/r/settings/BUILD.gn. TODO(dbeam): Is
-  // this still needed now that there's only 1 host name?
-  html_source->AddString("hostname", chrome::kChromeUISettingsHost);
 
 #if defined(OS_WIN)
   if (base::FeatureList::IsEnabled(safe_browsing::kInBrowserCleanerUIFeature)) {