Add DCHECKs to validate ProfileIOData's list of protocols.

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 26df993e8235b375b9c8698f2ba13a0421066eea..75e6bec5be331385d13e93b4a90c1757f56365ff 100644
--- a/chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc
+++ b/chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc
@@ -192,10 +192,6 @@ class FakeDelegate : public ProtocolHandlerRegistry::Delegate {
       const std::string& protocol,
       ProtocolHandlerRegistry* registry) override;
 
-  bool IsExternalHandlerRegistered(const std::string& protocol) override {
-    return registered_protocols_.find(protocol) != registered_protocols_.end();
-  }
-
   bool IsFakeRegisteredWithOS(const std::string& protocol) {
     return os_registered_protocols_.find(protocol) !=
         os_registered_protocols_.end();
@@ -215,6 +211,10 @@ class FakeDelegate : public ProtocolHandlerRegistry::Delegate {
 
   bool force_os_failure() { return force_os_failure_; }
 
+  bool IsExternalHandlerRegistered(const std::string& protocol) {
+    return registered_protocols_.find(protocol) != registered_protocols_.end();
+  }
+
  private:
   std::set<std::string> registered_protocols_;
   std::set<std::string> os_registered_protocols_;
@@ -443,13 +443,17 @@ TEST_F(ProtocolHandlerRegistryTest, ClearDefaultMakesProtocolNotHandled) {
 
 TEST_F(ProtocolHandlerRegistryTest, DisableDeregistersProtocolHandlers) {
   ASSERT_FALSE(delegate()->IsExternalHandlerRegistered("test"));
+  ASSERT_TRUE(delegate()->CanSchemeBeOverridden("test"));
   registry()->OnAcceptRegisterProtocolHandler(test_protocol_handler());
   ASSERT_TRUE(delegate()->IsExternalHandlerRegistered("test"));
+  ASSERT_FALSE(delegate()->CanSchemeBeOverridden("test"));
 
   registry()->Disable();
   ASSERT_FALSE(delegate()->IsExternalHandlerRegistered("test"));
+  ASSERT_TRUE(delegate()->CanSchemeBeOverridden("test"));
   registry()->Enable();
   ASSERT_TRUE(delegate()->IsExternalHandlerRegistered("test"));
+  ASSERT_FALSE(delegate()->CanSchemeBeOverridden("test"));
 }
 
 TEST_F(ProtocolHandlerRegistryTest, IgnoreProtocolHandler) {