Only generate suggested filenames when actually dragging an image.

third_party/WebKit/public/platform/WebURLResponse.h

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 156 matching lines @@
 
   BLINK_PLATFORM_EXPORT WebString mimeType() const;
   BLINK_PLATFORM_EXPORT void setMIMEType(const WebString&);
 
   BLINK_PLATFORM_EXPORT long long expectedContentLength() const;
   BLINK_PLATFORM_EXPORT void setExpectedContentLength(long long);
 
   BLINK_PLATFORM_EXPORT WebString textEncodingName() const;
   BLINK_PLATFORM_EXPORT void setTextEncodingName(const WebString&);
 
-  BLINK_PLATFORM_EXPORT WebString suggestedFileName() const;
-  BLINK_PLATFORM_EXPORT void setSuggestedFileName(const WebString&);
-
   BLINK_PLATFORM_EXPORT HTTPVersion httpVersion() const;
   BLINK_PLATFORM_EXPORT void setHTTPVersion(HTTPVersion);
 
   BLINK_PLATFORM_EXPORT int httpStatusCode() const;
   BLINK_PLATFORM_EXPORT void setHTTPStatusCode(int);
 
   BLINK_PLATFORM_EXPORT WebString httpStatusText() const;
   BLINK_PLATFORM_EXPORT void setHTTPStatusText(const WebString&);
 
   BLINK_PLATFORM_EXPORT WebString httpHeaderField(const WebString& name) const;
@@ skipping 149 matching lines @@
   // instance it contains.
   std::unique_ptr<ResourceResponseContainer> m_ownedResourceResponse;
 
   // Should never be null.
   ResourceResponse* m_resourceResponse;
 };
 
 }  // namespace blink
 
 #endif