Remove tools/clang (this will break things temporarily).

tools/clang/blink_gc_plugin/tests/trace_after_dispatch.txt

Index: tools/clang/blink_gc_plugin/tests/trace_after_dispatch.txt
diff --git a/tools/clang/blink_gc_plugin/tests/trace_after_dispatch.txt b/tools/clang/blink_gc_plugin/tests/trace_after_dispatch.txt
deleted file mode 100644
index 877fbbe6fdd166855ea3d5ad9e639456c1ab3cdb..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/trace_after_dispatch.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-trace_after_dispatch.cpp:11:1: warning: [blink-gc] Missing dispatch to class 'D' in manual trace dispatch.
-void A::trace(Visitor* visitor)
-^
-trace_after_dispatch.cpp:30:1: warning: [blink-gc] Base class 'A' of derived class 'B' requires tracing.
-void B::traceAfterDispatch(Visitor* visitor)
-^
-trace_after_dispatch.cpp:38:1: warning: [blink-gc] Class 'C' has untraced fields that require tracing.
-void C::traceAfterDispatch(Visitor* visitor)
-^
-./trace_after_dispatch.h:36:5: note: [blink-gc] Untraced field 'm_a' declared here:
-    Member<A> m_a;
-    ^
-3 warnings generated.