Remove EXPECT_REFV_EQ macro. It is unused.

Source/core/animation/animatable/AnimatableValueTestHelper.h

Index: Source/core/animation/animatable/AnimatableValueTestHelper.h
diff --git a/Source/core/animation/animatable/AnimatableValueTestHelper.h b/Source/core/animation/animatable/AnimatableValueTestHelper.h
index a1559845b72580f5212093df2395c95597be60f5..ef7a4c1cfef8685c2c65ab57b7bac3fd76a0777c 100644
--- a/Source/core/animation/animatable/AnimatableValueTestHelper.h
+++ b/Source/core/animation/animatable/AnimatableValueTestHelper.h
@@ -51,11 +51,6 @@
 
 #include "core/css/CSSValueTestHelper.h"
 
-// FIXME: Move to something like core/wtf/WTFTestHelpers.h
-// Compares the targets of two RefPtrs for equality.
-// (Objects still need an operator== defined for this to work).
-#define EXPECT_REFV_EQ(a, b) EXPECT_EQ(*(a.get()), *(b.get()))
-
 namespace blink {
 
 bool operator==(const AnimatableValue&, const AnimatableValue&);