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

tools/clang/blink_gc_plugin/tests/class_requires_trace_method.txt

Index: tools/clang/blink_gc_plugin/tests/class_requires_trace_method.txt
diff --git a/tools/clang/blink_gc_plugin/tests/class_requires_trace_method.txt b/tools/clang/blink_gc_plugin/tests/class_requires_trace_method.txt
deleted file mode 100644
index 15231c106d7c509260fefcbcf3de9cbe23d5cdc2..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/class_requires_trace_method.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-In file included from class_requires_trace_method.cpp:5:
-./class_requires_trace_method.h:14:1: warning: [blink-gc] Class 'PartObject' requires a trace method.
-class PartObject {
-^
-./class_requires_trace_method.h:17:5: note: [blink-gc] Untraced field 'm_obj' declared here:
-    Member<HeapObject> m_obj;
-    ^
-./class_requires_trace_method.h:20:1: warning: [blink-gc] Class 'HeapObject' requires a trace method.
-class HeapObject : public GarbageCollected<HeapObject> {
-^
-./class_requires_trace_method.h:22:5: note: [blink-gc] Untraced field 'm_part' declared here:
-    PartObject m_part;
-    ^
-./class_requires_trace_method.h:31:1: warning: [blink-gc] Class 'HeapObjectMixin' which inherits from GarbageCollectedMixin must locally declare and override trace(Visitor*)
-class HeapObjectMixin : public GarbageCollected<HeapObjectMixin>, public Mixin {
-^
-./class_requires_trace_method.h:40:1: warning: [blink-gc] Class 'HeapObjectMixin2' which inherits from GarbageCollectedMixin must locally declare and override trace(Visitor*)
-class HeapObjectMixin2
-^
-4 warnings generated.