[part 1] Make classes and structures in modules/ fast-allocated.

Source/modules/credentialmanager/CredentialManagerClient.h

Index: Source/modules/credentialmanager/CredentialManagerClient.h
diff --git a/Source/modules/credentialmanager/CredentialManagerClient.h b/Source/modules/credentialmanager/CredentialManagerClient.h
index a9117806636fe6e859ecf6b5914b856d767d8188..9a5e4b97ab21281685f9f9ad7cef5411bf04d2f7 100644
--- a/Source/modules/credentialmanager/CredentialManagerClient.h
+++ b/Source/modules/credentialmanager/CredentialManagerClient.h
@@ -22,6 +22,7 @@ class WebURL;
 // WebCredentialManagerClient's methods to make them visible to the bindings code.
 class MODULES_EXPORT CredentialManagerClient final : public NoBaseWillBeGarbageCollectedFinalized<CredentialManagerClient>, public WillBeHeapSupplement<Page> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CredentialManagerClient);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(CredentialManagerClient);
 public:
     explicit CredentialManagerClient(WebCredentialManagerClient*);
     virtual ~CredentialManagerClient();