Tidy fpdftext/ directory

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 372 matching lines @@
     "core/include/fpdfapi/ipdf_crypto_handler.h",
     "core/include/fpdfapi/ipdf_data_avail.h",
     "core/include/fpdfapi/ipdf_security_handler.h",
   ]
   configs += [ ":pdfium_config" ]
 }
 
 static_library("fpdftext") {
   sources = [
     "core/fpdftext/fpdf_text_int.cpp",
+    "core/fpdftext/fpdf_text_int.h",
     "core/fpdftext/include/ipdf_linkextract.h",
     "core/fpdftext/include/ipdf_textpage.h",
     "core/fpdftext/include/ipdf_textpagefind.h",
     "core/fpdftext/text_int.h",
     "core/fpdftext/unicodenormalization.cpp",
+    "core/fpdftext/unicodenormalization.h",
     "core/fpdftext/unicodenormalizationdata.cpp",
     "core/fpdftext/unicodenormalizationdata.h",
   ]
   configs += [ ":pdfium_config" ]
 }
 
 static_library("fxcodec") {
   deps = [
     "third_party:fx_lcms2",
     "third_party:fx_libopenjpeg",
@@ skipping 1113 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }