WTF/std normalization: replace WTF::Vector::first() with ::front()

mojo/public/cpp/bindings/wtf_array.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 MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_
 
 #include <stddef.h>
 #include <utility>
 
@@ skipping 70 matching lines @@
     // contain any elements.
     DCHECK(!is_null_ || vec_.isEmpty());
     return is_null_;
   }
 
   // Indicates whether the array is empty (which is distinct from null).
   bool empty() const { return vec_.isEmpty() && !is_null_; }
 
   // Returns a reference to the first element of the array. Calling this on a
   // null or empty array causes undefined behavior.
-  const T& front() const { return vec_.first(); }
-  T& front() { return vec_.first(); }
+  const T& front() const { return vec_.front(); }
+  T& front() { return vec_.front(); }
 
   // Returns the size of the array, which will be zero if the array is null.
   size_t size() const { return vec_.size(); }
 
   // Returns a reference to the element at zero-based |offset|. Calling this on
   // an array with size less than |offset|+1 causes undefined behavior.
   const T& at(size_t offset) const { return vec_.at(offset); }
   const T& operator[](size_t offset) const { return at(offset); }
   T& at(size_t offset) { return vec_.at(offset); }
   T& operator[](size_t offset) { return at(offset); }
@@ skipping 85 matching lines @@
 
   WTF::Vector<T> vec_;
   bool is_null_;
 
   DISALLOW_COPY_AND_ASSIGN(WTFArray);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_