Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

chrome/browser/captive_portal/captive_portal_tab_helper_unittest.cc

Index: chrome/browser/captive_portal/captive_portal_tab_helper_unittest.cc
diff --git a/chrome/browser/captive_portal/captive_portal_tab_helper_unittest.cc b/chrome/browser/captive_portal/captive_portal_tab_helper_unittest.cc
index 7693f7fdf8e3938a9401cfec5c696be0d1a0321f..03563155494c961521dbb45f46d17b8b7910e081 100644
--- a/chrome/browser/captive_portal/captive_portal_tab_helper_unittest.cc
+++ b/chrome/browser/captive_portal/captive_portal_tab_helper_unittest.cc
@@ -17,7 +17,6 @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
-#include "content/public/test/test_browser_thread.h"
 #include "net/base/net_errors.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -66,8 +65,7 @@ class CaptivePortalTabHelperTest : public ChromeRenderViewHostTestHarness {
  public:
   CaptivePortalTabHelperTest()
       : tab_helper_(NULL),
-        mock_reloader_(new testing::StrictMock<MockCaptivePortalTabReloader>),
-        ui_thread_(content::BrowserThread::UI, &message_loop_) {
+        mock_reloader_(new testing::StrictMock<MockCaptivePortalTabReloader>) {
     tab_helper_.SetTabReloaderForTest(mock_reloader_);
   }
   virtual ~CaptivePortalTabHelperTest() {}
@@ -220,8 +218,6 @@ class CaptivePortalTabHelperTest : public ChromeRenderViewHostTestHarness {
   // Owned by |tab_helper_|.
   testing::StrictMock<MockCaptivePortalTabReloader>* mock_reloader_;
 
-  content::TestBrowserThread ui_thread_;
-
   DISALLOW_COPY_AND_ASSIGN(CaptivePortalTabHelperTest);
 };