WebUI: Stop loading chrome://downloads in managed-footnote tests.

The test was loading chrome://downloads only so that loadTimeData is
initialized, but that's unnecessary and causes this test to break when
chrome://downloads is ported to Polymer3.

Bug: 1022215
Change-Id: Icea9f16913b1e9f9d8154f5cc1242004218cfb2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919569Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715953}

chrome/browser/ui/webui/test_data_source.cc

@@ -47,16 +47,6 @@ void TestDataSource::StartDataRequest(
     const content::WebContents::Getter& wc_getter,
     const content::URLDataSource::GotDataCallback& callback) {
   const std::string path = content::URLDataSource::URLToRequestPath(url);
-  // TODO(crbug/1009127): Make ReadFile take GURL().
-  if (path == "strings.m.js") {
-    std::string output = "import {loadTimeData} from ";
-    output.append("'chrome://resources/js/load_time_data.m.js';\n");
-    output.append("loadTimeData.data = {};");
-    scoped_refptr<base::RefCountedString> response =
-        base::RefCountedString::TakeString(&output);
-    callback.Run(response.get());
-    return;
-  }
   base::PostTask(
       FROM_HERE,
       {base::ThreadPool(), base::MayBlock(), base::TaskPriority::USER_BLOCKING},

chrome/test/data/webui/cr_components/cr_components_browsertest.js

@@ -43,7 +43,8 @@ CrComponentsManagedFootnoteTest.prototype = {
   __proto__: CrComponentsBrowserTest.prototype,
 
   /** @override */
-  browsePreload: 'chrome://downloads',
+  browsePreload:
+      'chrome://resources/cr_components/managed_footnote/managed_footnote.html',
 
   /** @override */
   extraLibraries: CrComponentsBrowserTest.prototype.extraLibraries.concat([

chrome/test/data/webui/cr_components/managed_footnote_test.js

@@ -7,7 +7,6 @@
 // clang-format off
 // #import 'chrome://resources/cr_components/managed_footnote/managed_footnote.m.js';
 //
-// #import '../strings.m.js';
 // #import {flush} from 'chrome://resources/polymer/v3_0/polymer/polymer_bundled.min.js';
 // #import {isChromeOS} from 'chrome://resources/js/cr.m.js';
 // #import {loadTimeData} from 'chrome://resources/js/load_time_data.m.js';
@@ -25,11 +24,11 @@ cr.define('managed_footnote_test', function() {
   const suiteName = 'ManagedFootnoteTest';
 
   suite(suiteName, function() {
-    setup(function() {
-      PolymerTest.clearBody();
+    suiteSetup(function() {
+      loadTimeData.data = {};
     });
 
-    teardown(function() {
+    setup(function() {
       PolymerTest.clearBody();
     });