Initialize the message center as part of the testing browser process

chrome/test/base/testing_browser_process.cc

Index: chrome/test/base/testing_browser_process.cc
diff --git a/chrome/test/base/testing_browser_process.cc b/chrome/test/base/testing_browser_process.cc
index 72409a87fca65add4fcfaba9f60958d13a0bbd89..57f6029dff80c8a7ceac05f72b3f5baccac77d42 100644
--- a/chrome/test/base/testing_browser_process.cc
+++ b/chrome/test/base/testing_browser_process.cc
@@ -75,6 +75,7 @@ TestingBrowserProcess::TestingBrowserProcess()
       system_request_context_(nullptr),
       rappor_service_(nullptr),
       platform_part_(new TestingBrowserProcessPlatformPart()) {
+  message_center::MessageCenter::Initialize();
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   extensions_browser_client_.reset(
       new extensions::ChromeExtensionsBrowserClient);
@@ -90,6 +91,7 @@ TestingBrowserProcess::~TestingBrowserProcess() {
   extensions::ExtensionsBrowserClient::Set(nullptr);
 #endif
 
+  message_center::MessageCenter::Shutdown();
   // Destructors for some objects owned by TestingBrowserProcess will use
   // g_browser_process if it is not null, so it must be null before proceeding.
   DCHECK_EQ(static_cast<BrowserProcess*>(nullptr), g_browser_process);