ui: Remove gfx::Size::ClampToNonNegative, prevent negative sizes always.

ui/gfx/size_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/size_base.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/size_f.h"
@@ skipping 73 matching lines @@
   EXPECT_EQ(Size(11, 11), ToRoundedSize(SizeF(10.5f, 10.5f)));
   EXPECT_EQ(Size(11, 11), ToRoundedSize(SizeF(10.9999f, 10.9999f)));
 
   EXPECT_EQ(Size(-10, -10), ToRoundedSize(SizeF(-10, -10)));
   EXPECT_EQ(Size(-10, -10), ToRoundedSize(SizeF(-10.0001f, -10.0001f)));
   EXPECT_EQ(Size(-10, -10), ToRoundedSize(SizeF(-10.4999f, -10.4999f)));
   EXPECT_EQ(Size(-11, -11), ToRoundedSize(SizeF(-10.5f, -10.5f)));
   EXPECT_EQ(Size(-11, -11), ToRoundedSize(SizeF(-10.9999f, -10.9999f)));
 }
 
+TEST(SizeTest, ClampToZero) {
+  EXPECT_EQ(Size().ToString(), Size(-1, -1).ToString());
+  EXPECT_EQ(Size().ToString(), Size(0, -1).ToString());
+  EXPECT_EQ(Size().ToString(), Size(-1, 0).ToString());
+
+  EXPECT_EQ(SizeF().ToString(), SizeF(-1, -1).ToString());
+  EXPECT_EQ(SizeF().ToString(), SizeF(0, -1).ToString());
+  EXPECT_EQ(SizeF().ToString(), SizeF(-1, 0).ToString());
+
+  EXPECT_EQ(SizeF().ToString(), SizeF(1, 1).Scale(-1).ToString());
+}
+
 }  // namespace gfx