GTTF: Use a fresh TestingBrowserProcess for each test, part #4

chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc

Index: chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc
diff --git a/chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc b/chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc
index c8b81700902d5183f05fb9739b7dad103c148317..dcd08298bc8986fe803197852840acd0c0515c82 100644
--- a/chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc
+++ b/chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc
@@ -188,7 +188,7 @@ class QueryProtocolHandlerOnChange : public NotificationObserver {
   NotificationRegistrar notification_registrar_;
 };
 
-class ProtocolHandlerRegistryTest : public testing::Test {
+class ProtocolHandlerRegistryTest : public TestingBrowserProcessTest {
  protected:
   ProtocolHandlerRegistryTest()
       : test_protocol_handler_(CreateProtocolHandler("test", "test")) {}