Support ignorance of base class finalizers.

tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.txt

Index: tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.txt
diff --git a/tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.txt b/tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.txt
index 935883d07f315db7221ac31ee05a4c6aa5405f71..9efbf13791c390cee10946b958241775021a549e 100644
--- a/tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.txt
+++ b/tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.txt
@@ -1,8 +1,14 @@
 In file included from class_requires_finalization_base.cpp:5:
-./class_requires_finalization_base.h:23:1: warning: [blink-gc] Class 'NeedsFinalizer' requires finalization.
+./class_requires_finalization_base.h:28:1: warning: [blink-gc] Class 'NeedsFinalizer' requires finalization.
 class NeedsFinalizer : public A, public B {
 ^
-./class_requires_finalization_base.h:23:34: note: [blink-gc] Base class 'B' requiring finalization declared here:
+./class_requires_finalization_base.h:28:34: note: [blink-gc] Base class 'B' requiring finalization declared here:
 class NeedsFinalizer : public A, public B {
                                  ^
-1 warning generated.
+./class_requires_finalization_base.h:45:1: warning: [blink-gc] Class 'ClassWithSomeButNotAllIgnoredBasesDoesNeedFinalizer' requires finalization.
+class ClassWithSomeButNotAllIgnoredBasesDoesNeedFinalizer
+^
+./class_requires_finalization_base.h:46:17: note: [blink-gc] Base class 'B' requiring finalization declared here:
+    : public A, public B, public ScriptWrappable {
+                ^
+2 warnings generated.