Revert of Simplify BrowserContext by removing redundant methods.

components/feedback/feedback_uploader_chrome_unittest.cc

Index: components/feedback/feedback_uploader_chrome_unittest.cc
diff --git a/components/feedback/feedback_uploader_chrome_unittest.cc b/components/feedback/feedback_uploader_chrome_unittest.cc
index 7db46872e2f4b7e86b93399e6fc082815703ed24..1b6084b74580e9a76b1d61ad34dd066d3a112a97 100644
--- a/components/feedback/feedback_uploader_chrome_unittest.cc
+++ b/components/feedback/feedback_uploader_chrome_unittest.cc
@@ -7,11 +7,11 @@
 #include <string>
 
 #include "base/macros.h"
+#include "base/message_loop/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "components/variations/variations_associated_data.h"
 #include "components/variations/variations_http_header_provider.h"
 #include "content/public/test/test_browser_context.h"
-#include "content/public/test/test_browser_thread_bundle.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -20,8 +20,7 @@
 
 class FeedbackUploaderChromeTest : public ::testing::Test {
  protected:
-  FeedbackUploaderChromeTest()
-      : browser_thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP) {}
+  FeedbackUploaderChromeTest() {}
 
   ~FeedbackUploaderChromeTest() override {
     // Clean up registered ids.
@@ -40,7 +39,7 @@
   }
 
  private:
-  content::TestBrowserThreadBundle browser_thread_bundle_;
+  base::MessageLoopForUI message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(FeedbackUploaderChromeTest);
 };