Unify geometry test printers in a test support target.

Source/core/layout/OverflowModelTest.cpp

Index: Source/core/layout/OverflowModelTest.cpp
diff --git a/Source/core/layout/OverflowModelTest.cpp b/Source/core/layout/OverflowModelTest.cpp
index 4418efc7ab3400a299d793cd3ccce818bd687717..ccca93bd49cd2847eef2f0e72ed5190a3a365889 100644
--- a/Source/core/layout/OverflowModelTest.cpp
+++ b/Source/core/layout/OverflowModelTest.cpp
@@ -35,17 +35,6 @@
 #include <gtest/gtest.h>
 
 namespace blink {
-
-// FIXME: Move this somewhere more generic.
-void PrintTo(const LayoutRect& rect, std::ostream* os)
-{
-    *os << "LayoutRect("
-        << rect.x().toFloat() << ", "
-        << rect.y().toFloat() << ", "
-        << rect.width().toFloat() << ", "
-        << rect.height().toFloat() << ")";
-}
-
 namespace {
 
 LayoutRect initialLayoutOverflow()
@@ -187,5 +176,4 @@ TEST_F(OverflowModelTest, MoveAffectsContentsVisualOverflow)
 }
 
 } // anonymous namespace
-
 } // namespace blink