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

tools/clang/blink_gc_plugin/tests/persistent_field_in_gc_managed_class.txt

Index: tools/clang/blink_gc_plugin/tests/persistent_field_in_gc_managed_class.txt
diff --git a/tools/clang/blink_gc_plugin/tests/persistent_field_in_gc_managed_class.txt b/tools/clang/blink_gc_plugin/tests/persistent_field_in_gc_managed_class.txt
deleted file mode 100644
index d69c0c57f7d4fa8a734918c60e7315fc41abd7c5..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/persistent_field_in_gc_managed_class.txt
+++ /dev/null
@@ -1,26 +0,0 @@
-In file included from persistent_field_in_gc_managed_class.cpp:5:
-./persistent_field_in_gc_managed_class.h:20:1: warning: [blink-gc] Class 'HeapObject' contains GC root in field 'm_part'.
-class HeapObject : public GarbageCollected<HeapObject> {
-^
-./persistent_field_in_gc_managed_class.h:24:5: note: [blink-gc] Field 'm_part' with embedded GC root in 'HeapObject' declared here:
-    PartObject m_part;
-    ^
-./persistent_field_in_gc_managed_class.h:17:5: note: [blink-gc] Field 'm_obj' defining a GC root declared here:
-    Persistent<HeapObject> m_obj;
-    ^
-./persistent_field_in_gc_managed_class.h:20:1: warning: [blink-gc] Class 'HeapObject' contains GC root in field 'm_parts'.
-class HeapObject : public GarbageCollected<HeapObject> {
-^
-./persistent_field_in_gc_managed_class.h:25:5: note: [blink-gc] Field 'm_parts' with embedded GC root in 'HeapObject' declared here:
-    HeapVector<PartObject> m_parts;
-    ^
-./persistent_field_in_gc_managed_class.h:17:5: note: [blink-gc] Field 'm_obj' defining a GC root declared here:
-    Persistent<HeapObject> m_obj;
-    ^
-./persistent_field_in_gc_managed_class.h:20:1: warning: [blink-gc] Class 'HeapObject' contains GC root in field 'm_objs'.
-class HeapObject : public GarbageCollected<HeapObject> {
-^
-./persistent_field_in_gc_managed_class.h:26:5: note: [blink-gc] Field 'm_objs' defining a GC root declared here:
-    PersistentHeapVector<Member<HeapObject> > m_objs;
-    ^
-3 warnings generated.