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

tools/clang/blink_gc_plugin/tests/left_most_gc_base.txt

Index: tools/clang/blink_gc_plugin/tests/left_most_gc_base.txt
diff --git a/tools/clang/blink_gc_plugin/tests/left_most_gc_base.txt b/tools/clang/blink_gc_plugin/tests/left_most_gc_base.txt
deleted file mode 100644
index e2d04186773d828a5a180fc250f60d92a983b6a9..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/tests/left_most_gc_base.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-In file included from left_most_gc_base.cpp:5:
-./left_most_gc_base.h:15:1: warning: [blink-gc] Class 'Right' must derive its GC base in the left-most position.
-class Right : public A, public B, public GarbageCollected<Right> { };  // Error
-^
-./left_most_gc_base.h:18:1: warning: [blink-gc] Class 'DerivedRight' must derive its GC base in the left-most position.
-class DerivedRight : public Right, public Left { };  // Error
-^
-./left_most_gc_base.h:12:1: warning: [blink-gc] Left-most base class 'A' of derived class 'IllFormed' must be polymorphic.
-class A { };
-^
-./left_most_gc_base.h:26:1: warning: [blink-gc] Class 'IllFormed' must derive its GC base in the left-most position.
-class IllFormed : public A, public C { }; // Error
-^
-4 warnings generated.