Unify geometry test printers in a test support target.

Source/platform/geometry/FloatBoxTestHelpers.cpp

Index: Source/platform/geometry/FloatBoxTestHelpers.cpp
diff --git a/Source/platform/geometry/FloatBoxTestHelpers.cpp b/Source/platform/geometry/FloatBoxTestHelpers.cpp
index 5a15710597e3874f64d81b1e0aa5a8f447b4fe8a..a40d97ee837ff757acc54f5004edbe7114b88b31 100644
--- a/Source/platform/geometry/FloatBoxTestHelpers.cpp
+++ b/Source/platform/geometry/FloatBoxTestHelpers.cpp
@@ -30,18 +30,6 @@
 const static float kTestEpsilon = 1e-6;
 
 namespace blink {
-
-void PrintTo(const FloatBox& box, ::std::ostream* os)
-{
-    *os << "FloatBox("
-        << box.x() << ", "
-        << box.y() << ", "
-        << box.z() << ", "
-        << box.width() << ", "
-        << box.height() << ", "
-        << box.depth() << ")";
-}
-
 namespace FloatBoxTest {
 
 bool ApproximatelyEqual(const float& a, const float& b)