Remove |using base::StringPiece| from net/spdy header files.

net/spdy/hpack/hpack_static_table.cc

 // Copyright 2014 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.
 
 #include "net/spdy/hpack/hpack_static_table.h"
 
 #include "base/logging.h"
 #include "net/spdy/hpack/hpack_constants.h"
 #include "net/spdy/hpack/hpack_entry.h"
 
 namespace net {
 
 HpackStaticTable::HpackStaticTable() {}
 
 HpackStaticTable::~HpackStaticTable() {}
 
 void HpackStaticTable::Initialize(const HpackStaticEntry* static_entry_table,
                                   size_t static_entry_count) {
   CHECK(!IsInitialized());
 
   int total_insertions = 0;
   for (const HpackStaticEntry* it = static_entry_table;
        it != static_entry_table + static_entry_count; ++it) {
-    static_entries_.push_back(HpackEntry(StringPiece(it->name, it->name_len),
-                                         StringPiece(it->value, it->value_len),
-                                         true,  // is_static
-                                         total_insertions));
+    static_entries_.push_back(
+        HpackEntry(base::StringPiece(it->name, it->name_len),
+                   base::StringPiece(it->value, it->value_len),
+                   true,  // is_static
+                   total_insertions));
     CHECK(static_index_.insert(&static_entries_.back()).second);
 
     ++total_insertions;
   }
 }
 
 bool HpackStaticTable::IsInitialized() const {
   return !static_entries_.empty();
 }
 
 }  // namespace net