Fix C4334 (32-bit shift converted to 64-bit) warnings

net/spdy/hpack/hpack_huffman_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_huffman_table.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 151 matching lines @@
   for (size_t i = 0; i != decode_tables_.size(); i++) {
     const DecodeTable& table = decode_tables_[i];
     uint8_t total_indexed = table.prefix_length + table.indexed_length;
 
     size_t j = 0;
     while (j != table.size()) {
       const DecodeEntry& entry = Entry(table, j);
       if (entry.length != 0 && entry.length < total_indexed) {
         // The difference between entry & table bit counts tells us how
         // many additional entries map to this one.
-        size_t fill_count = 1 << (total_indexed - entry.length);
+        size_t fill_count = static_cast<size_t>(1)
+                            << (total_indexed - entry.length);
         CHECK_LE(j + fill_count, table.size());
 
         for (size_t k = 1; k != fill_count; k++) {
           CHECK_EQ(Entry(table, j + k).length, 0);
           SetEntry(table, j + k, entry);
         }
         j += fill_count;
       } else {
         j++;
       }
@@ skipping 133 matching lines @@
       bits = bits << entry.length;
       bits_available -= entry.length;
     }
     peeked_success = in->PeekBits(&bits_available, &bits);
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace net