Remove unnecessary zoom argument from GetImage() as its value is always available through the Layou…

third_party/WebKit/Source/core/css/CSSPaintImageGenerator.h

 // Copyright 2016 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.
 
 #ifndef CSSPaintImageGenerator_h
 #define CSSPaintImageGenerator_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "core/css/cssom/CSSStyleValue.h"
@@ skipping 31 matching lines @@
   typedef CSSPaintImageGenerator* (*CSSPaintImageGeneratorCreateFunction)(
       const String&,
       Document&,
       Observer*);
   static void Init(CSSPaintImageGeneratorCreateFunction);
 
   // Invokes the CSS Paint API 'paint' callback. May return a nullptr
   // representing an invalid image if an error occurred.
   virtual PassRefPtr<Image> Paint(const LayoutObject&,
                                   const IntSize&,
-                                  float zoom,
                                   const CSSStyleValueVector*) = 0;
 
   virtual const Vector<CSSPropertyID>& NativeInvalidationProperties() const = 0;
   virtual const Vector<AtomicString>& CustomInvalidationProperties() const = 0;
   virtual bool HasAlpha() const = 0;
   virtual const Vector<CSSSyntaxDescriptor>& InputArgumentTypes() const = 0;
   virtual bool IsImageGeneratorReady() const = 0;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 };
 
 }  // namespace blink
 
 #endif  // CSSPaintImageGenerator_h