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

chrome/browser/ui/extensions/shell_window.h

Index: chrome/browser/ui/extensions/shell_window.h
diff --git a/chrome/browser/ui/extensions/shell_window.h b/chrome/browser/ui/extensions/shell_window.h
index 33286a7a14ab18d9f24e395c33070579f0a97f23..a2c91d584fd49b4dff6bd56f4cbe2005099cbebd 100644
--- a/chrome/browser/ui/extensions/shell_window.h
+++ b/chrome/browser/ui/extensions/shell_window.h
@@ -55,8 +55,8 @@ class ShellWindow : public content::NotificationObserver,
 
     Frame frame;
     // Specify the initial bounds of the window. INT_MIN designates
-    // 'unspecified' for any coordinate, and should be replaced with a default
-    // value.
+    // 'unspecified' for the position components, and 0 for the size components.
+    // When unspecified, they should be replaced with a default value.
     gfx::Rect bounds;
     // Specify if bounds should be restored from a previous time.
     bool restore_position;