Unpack theme data from extensions off of UI thread.

chrome/browser/ui/search/instant_extended_interactive_uitest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 
 #include <sstream>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 273 matching lines @@
   }
 
   void InstallThemeSource() {
     ThemeSource* theme = new ThemeSource(profile());
     content::URLDataSource::Add(profile(), theme);
   }
 
   void InstallThemeAndVerify(const std::string& theme_dir,
                              const std::string& theme_name) {
     const extensions::Extension* theme =
-        ThemeServiceFactory::GetThemeForProfile(
-            ExtensionBrowserTest::browser()->profile());
+        ThemeServiceFactory::GetThemeForProfile(profile());
     // If there is already a theme installed, the current theme should be
     // disabled and the new one installed + enabled.
     int expected_change = theme ? 0 : 1;
 
     const base::FilePath theme_path = test_data_dir_.AppendASCII(theme_dir);
     ASSERT_TRUE(InstallExtensionWithUIAutoConfirm(
         theme_path, expected_change, ExtensionBrowserTest::browser()));
+    content::WindowedNotificationObserver theme_change_observer(
+        chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
+        content::Source<ThemeService>(
+            ThemeServiceFactory::GetForProfile(profile())));
+    theme_change_observer.Wait();
     const extensions::Extension* new_theme =
-        ThemeServiceFactory::GetThemeForProfile(
-            ExtensionBrowserTest::browser()->profile());
+        ThemeServiceFactory::GetThemeForProfile(profile());
     ASSERT_NE(static_cast<extensions::Extension*>(NULL), new_theme);
     ASSERT_EQ(new_theme->name(), theme_name);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstantPolicyTest);
 };
 
 // TODO(https://crbug.com/678975): Flaky on memory bot (all platforms).
 IN_PROC_BROWSER_TEST_F(InstantExtendedTest,
@@ skipping 417 matching lines @@
   stream << "link.href = \"" << result_url.spec() << "\";";
   stream << "document.body.appendChild(link);";
   stream << "link.click();";
   EXPECT_TRUE(content::ExecuteScript(contents, stream.str()));
 
   content::WaitForLoadStop(contents);
   std::string expected_title =
       "Referrer is " + instant_url().GetWithEmptyPath().spec();
   EXPECT_EQ(ASCIIToUTF16(expected_title), contents->GetTitle());
 }