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

tools/clang/blink_gc_plugin/tests/fields_require_tracing.txt

Index: tools/clang/blink_gc_plugin/tests/fields_require_tracing.txt
diff --git a/tools/clang/blink_gc_plugin/tests/fields_require_tracing.txt b/tools/clang/blink_gc_plugin/tests/fields_require_tracing.txt
deleted file mode 100644
index 39d49f340eda5f3816fd9c28a0790584fa511bd5..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/fields_require_tracing.txt
+++ /dev/null
@@ -1,22 +0,0 @@
-fields_require_tracing.cpp:9:1: warning: [blink-gc] Class 'PartObject' has untraced fields that require tracing.
-void PartObject::trace(Visitor* visitor) {
-^
-./fields_require_tracing.h:29:5: note: [blink-gc] Untraced field 'm_obj1' declared here:
-    Member<HeapObject> m_obj1;
-    ^
-./fields_require_tracing.h:31:5: note: [blink-gc] Untraced field 'm_obj3' declared here:
-    Member<HeapObject> m_obj3;
-    ^
-fields_require_tracing.cpp:16:1: warning: [blink-gc] Class 'PartBObject' has untraced fields that require tracing.
-void PartBObject::trace(Visitor* visitor) {
-^
-./fields_require_tracing.h:20:5: note: [blink-gc] Untraced field 'm_set' declared here:
-    HeapHashSet<PartBObject> m_set;
-    ^
-fields_require_tracing.cpp:21:1: warning: [blink-gc] Class 'HeapObject' has untraced fields that require tracing.
-void HeapObject::trace(Visitor* visitor) {
-^
-./fields_require_tracing.h:40:5: note: [blink-gc] Untraced field 'm_part' declared here:
-    PartObject m_part;
-    ^
-3 warnings generated.