Make the vast majority of JS headers private to src/javascript.

BUILD.gn

 # 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.
 
 import("//testing/test.gni")
 
 pdf_use_skia = false
 
 declare_args() {
   # On Android there's no system FreeType. On Windows and Mac, only a few
@@ skipping 612 matching lines @@
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
   ]
 }
 
 static_library("javascript") {
   sources = [
-    "fpdfsdk/include/javascript/Consts.h",
-    "fpdfsdk/include/javascript/Document.h",
-    "fpdfsdk/include/javascript/Field.h",
     "fpdfsdk/include/javascript/IJavaScript.h",
-    "fpdfsdk/include/javascript/Icon.h",
-    "fpdfsdk/include/javascript/JS_Context.h",
-    "fpdfsdk/include/javascript/JS_Define.h",
-    "fpdfsdk/include/javascript/JS_EventHandler.h",
-    "fpdfsdk/include/javascript/JS_GlobalData.h",
-    "fpdfsdk/include/javascript/JS_Object.h",
-    "fpdfsdk/include/javascript/JS_Runtime.h",
-    "fpdfsdk/include/javascript/JS_Value.h",
-    "fpdfsdk/include/javascript/PublicMethods.h",
-    "fpdfsdk/include/javascript/app.h",
-    "fpdfsdk/include/javascript/color.h",
-    "fpdfsdk/include/javascript/console.h",
-    "fpdfsdk/include/javascript/event.h",
-    "fpdfsdk/include/javascript/global.h",
-    "fpdfsdk/include/javascript/report.h",
-    "fpdfsdk/include/javascript/resource.h",
-    "fpdfsdk/include/javascript/util.h",
     "fpdfsdk/src/javascript/Consts.cpp",
+    "fpdfsdk/src/javascript/Consts.h",
     "fpdfsdk/src/javascript/Document.cpp",
+    "fpdfsdk/src/javascript/Document.h",
     "fpdfsdk/src/javascript/Field.cpp",
+    "fpdfsdk/src/javascript/Field.h",
     "fpdfsdk/src/javascript/Icon.cpp",
+    "fpdfsdk/src/javascript/Icon.h",
     "fpdfsdk/src/javascript/JS_Context.cpp",
+    "fpdfsdk/src/javascript/JS_Context.h",
+    "fpdfsdk/src/javascript/JS_Define.h",
     "fpdfsdk/src/javascript/JS_EventHandler.cpp",
+    "fpdfsdk/src/javascript/JS_EventHandler.h",
     "fpdfsdk/src/javascript/JS_GlobalData.cpp",
+    "fpdfsdk/src/javascript/JS_GlobalData.h",
     "fpdfsdk/src/javascript/JS_Object.cpp",
+    "fpdfsdk/src/javascript/JS_Object.h",
     "fpdfsdk/src/javascript/JS_Runtime.cpp",
+    "fpdfsdk/src/javascript/JS_Runtime.h",
     "fpdfsdk/src/javascript/JS_Value.cpp",
+    "fpdfsdk/src/javascript/JS_Value.h",
     "fpdfsdk/src/javascript/PublicMethods.cpp",
+    "fpdfsdk/src/javascript/PublicMethods.h",
     "fpdfsdk/src/javascript/app.cpp",
+    "fpdfsdk/src/javascript/app.h",
     "fpdfsdk/src/javascript/color.cpp",
+    "fpdfsdk/src/javascript/color.h",
     "fpdfsdk/src/javascript/console.cpp",
+    "fpdfsdk/src/javascript/console.h",
     "fpdfsdk/src/javascript/event.cpp",
+    "fpdfsdk/src/javascript/event.h",
     "fpdfsdk/src/javascript/global.cpp",
+    "fpdfsdk/src/javascript/global.h",
     "fpdfsdk/src/javascript/report.cpp",
+    "fpdfsdk/src/javascript/report.h",
     "fpdfsdk/src/javascript/resource.cpp",
+    "fpdfsdk/src/javascript/resource.h",
     "fpdfsdk/src/javascript/util.cpp",
+    "fpdfsdk/src/javascript/util.h",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
   ]
   include_dirs = [
     "//v8",
     "//v8/include",
@@ skipping 113 matching lines @@
     "//v8",
     "//v8/include",
     "."
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
   ]
 }