Reimplement min-width: auto

Source/core/html/shadow/TextControlInnerElements.cpp

 /*
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 67 matching lines @@
 }
 
 PassRefPtr<ComputedStyle> EditingViewPortElement::customStyleForLayoutObject()
 {
     // FXIME: Move these styles to html.css.
 
     RefPtr<ComputedStyle> style = ComputedStyle::create();
     style->inheritFrom(shadowHost()->computedStyleRef());
 
     style->setFlexGrow(1);
+    style->setMinWidth(Length(0, Fixed));
     style->setDisplay(BLOCK);
     style->setDirection(LTR);
 
     // We don't want the shadow dom to be editable, so we set this block to
     // read-only in case the input itself is editable.
     style->setUserModify(READ_ONLY);
     style->setUnique();
 
     return style.release();
 }
@@ skipping 145 matching lines @@
 bool SearchFieldCancelButtonElement::willRespondToMouseClickEvents()
 {
     const HTMLInputElement* input = toHTMLInputElement(shadowHost());
     if (input && !input->isDisabledOrReadOnly())
         return true;
 
     return HTMLDivElement::willRespondToMouseClickEvents();
 }
 
 }