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

ui/gfx/size_f.cc

Index: ui/gfx/size_f.cc
diff --git a/ui/gfx/size_f.cc b/ui/gfx/size_f.cc
index 96c186788e4ad23092b8078aff415270e74bc8c7..0aad4ad6556cc84ddc5a8e4414e9a0f7e407fa7f 100644
--- a/ui/gfx/size_f.cc
+++ b/ui/gfx/size_f.cc
@@ -4,8 +4,8 @@
 
 #include "ui/gfx/size_f.h"
 
-#include "base/logging.h"
 #include "base/stringprintf.h"
+#include "ui/gfx/size_base_impl.h"
 
 namespace gfx {
 
@@ -13,9 +13,8 @@ template class SizeBase<SizeF, float>;
 
 SizeF::SizeF() : SizeBase<SizeF, float>(0, 0) {}
 
-SizeF::SizeF(float width, float height) : SizeBase<SizeF, float>(0, 0) {
-  set_width(width);
-  set_height(height);
+SizeF::SizeF(float width, float height)
+    : SizeBase<SizeF, float>(width, height) {
 }
 
 SizeF::~SizeF() {}