Convert UtilityProcessHost to bootstrap Mojo Channel using the Shell connection

chrome/browser/extensions/extension_gcm_app_handler_unittest.cc

Index: chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
diff --git a/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc b/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
index a04d0535df18bdc0b204a1b8c6ec43640192164d..0bea321bee93e56f260ad2e75f57b0d336c075d9 100644
--- a/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
+++ b/chrome/browser/extensions/extension_gcm_app_handler_unittest.cc
@@ -45,6 +45,7 @@
 #include "components/signin/core/browser/signin_manager.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/shell_context.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/browser/extension_system.h"
@@ -230,6 +231,7 @@ class ExtensionGCMAppHandlerTest : public testing::Test {
 
   // Overridden from test::Test:
   void SetUp() override {
+    shell_context_ = content::ShellContext::Create();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
 
     // Make BrowserThread work in unittest.
@@ -397,6 +399,7 @@ class ExtensionGCMAppHandlerTest : public testing::Test {
   std::unique_ptr<content::InProcessUtilityThreadHelper>
       in_process_utility_thread_helper_;
   std::unique_ptr<TestingProfile> profile_;
+  std::unique_ptr<content::ShellContext> shell_context_;
   ExtensionService* extension_service_;  // Not owned.
   base::ScopedTempDir temp_dir_;