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

tools/clang/blink_gc_plugin/tests/non_virtual_trace.txt

Index: tools/clang/blink_gc_plugin/tests/non_virtual_trace.txt
diff --git a/tools/clang/blink_gc_plugin/tests/non_virtual_trace.txt b/tools/clang/blink_gc_plugin/tests/non_virtual_trace.txt
deleted file mode 100644
index a05a94de8975730dab781fee5f94d98a6bad1cb4..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/non_virtual_trace.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-In file included from non_virtual_trace.cpp:5:
-./non_virtual_trace.h:12:1: warning: [blink-gc] Left-most base class 'A' of derived class 'D' must define a virtual trace method.
-class A : public GarbageCollected<A> {
-^
-non_virtual_trace.cpp:13:1: warning: [blink-gc] Class 'C' overrides non-virtual trace of base class 'A'.
-void C::trace(Visitor* visitor)
-^
-./non_virtual_trace.h:14:5: note: [blink-gc] Non-virtual trace method declared here:
-    void trace(Visitor*);
-    ^
-non_virtual_trace.cpp:18:1: warning: [blink-gc] Class 'D' overrides non-virtual trace of base class 'A'.
-void D::trace(Visitor* visitor)
-^
-./non_virtual_trace.h:14:5: note: [blink-gc] Non-virtual trace method declared here:
-    void trace(Visitor*);
-    ^
-3 warnings generated.