Make StringData a templated class.

BUILD.gn

 # 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.
 
 import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
@@ skipping 570 matching lines @@
   if (is_clang) {
     cflags = [
       # http://code.google.com/p/pdfium/issues/detail?id=188
       "-Wno-switch",
     ]
   }
 }
 
 static_library("fxcrt") {
   sources = [
+    "core/fxcrt/cfx_string_data_template.h",
     "core/fxcrt/extension.h",
     "core/fxcrt/fx_basic_array.cpp",
     "core/fxcrt/fx_basic_bstring.cpp",
     "core/fxcrt/fx_basic_buffer.cpp",
     "core/fxcrt/fx_basic_coords.cpp",
     "core/fxcrt/fx_basic_gcc.cpp",
     "core/fxcrt/fx_basic_list.cpp",
     "core/fxcrt/fx_basic_memmgr.cpp",
     "core/fxcrt/fx_basic_plex.cpp",
     "core/fxcrt/fx_basic_utf.cpp",
@@ skipping 1072 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }