Provide a std::vector compliant empty() method for WebVector.

third_party/WebKit/public/platform/WebMediaConstraints.h

 /*
  * Copyright (C) 2012 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 155 matching lines @@
   void setExact(const WebString& exact) { m_exact.assign(&exact, 1); }
 
   void setExact(const WebVector<WebString>& exact) { m_exact.assign(exact); }
 
   void setIdeal(const WebVector<WebString>& ideal) { m_ideal.assign(ideal); }
 
   bool matches(WebString value) const;
   bool isEmpty() const override;
   bool hasMandatory() const override;
   WebString toString() const override;
-  bool hasExact() const { return !m_exact.isEmpty(); }
-  bool hasIdeal() const { return !m_ideal.isEmpty(); }
+  bool hasExact() const { return !m_exact.empty(); }
+  bool hasIdeal() const { return !m_ideal.empty(); }
   const WebVector<WebString>& exact() const;
   const WebVector<WebString>& ideal() const;
 
  private:
   WebVector<WebString> m_exact;
   WebVector<WebString> m_ideal;
 };
 
 class BLINK_PLATFORM_EXPORT BooleanConstraint : public BaseConstraint {
  public:
@@ skipping 130 matching lines @@
 
   BLINK_PLATFORM_EXPORT const WebString toString() const;
 
  private:
   WebPrivatePtr<WebMediaConstraintsPrivate> m_private;
 };
 
 }  // namespace blink
 
 #endif  // WebMediaConstraints_h