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

pdfium.gyp

 {
   'variables': {
     'pdf_use_skia%': 0,
     'conditions': [
       ['OS=="linux"', {
         'bundle_freetype%': 0,
       }, {  # On Android there's no system FreeType. On Windows and Mac, only a
             # few methods are used from it.
         'bundle_freetype%': 1,
       }],
@@ skipping 605 matching lines @@
         '<(DEPTH)/v8/include',
       ],
       'dependencies': [
         '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
       ],
       'export_dependent_settings': [
         '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
       ],
       'ldflags': [ '-L<(PRODUCT_DIR)',],
       'sources': [
-        'fpdfsdk/include/javascript/app.h',
-        'fpdfsdk/include/javascript/color.h',
-        'fpdfsdk/include/javascript/console.h',
-        'fpdfsdk/include/javascript/Consts.h',
-        'fpdfsdk/include/javascript/Document.h',
-        'fpdfsdk/include/javascript/event.h',
-        'fpdfsdk/include/javascript/Field.h',
-        'fpdfsdk/include/javascript/global.h',
-        'fpdfsdk/include/javascript/Icon.h',
         'fpdfsdk/include/javascript/IJavaScript.h',
-        'fpdfsdk/include/javascript/JavaScript.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/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/Consts.cpp',
-        'fpdfsdk/src/javascript/Document.cpp',
+        'fpdfsdk/src/javascript/console.h',
         'fpdfsdk/src/javascript/event.cpp',
-        'fpdfsdk/src/javascript/Field.cpp',
+        'fpdfsdk/src/javascript/event.h',
         'fpdfsdk/src/javascript/global.cpp',
-        'fpdfsdk/src/javascript/Icon.cpp',
-        'fpdfsdk/src/javascript/JS_Context.cpp',
-        'fpdfsdk/src/javascript/JS_EventHandler.cpp',
-        'fpdfsdk/src/javascript/JS_GlobalData.cpp',
-        'fpdfsdk/src/javascript/JS_Object.cpp',
-        'fpdfsdk/src/javascript/JS_Runtime.cpp',
-        'fpdfsdk/src/javascript/JS_Value.cpp',
-        'fpdfsdk/src/javascript/PublicMethods.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',
       ],
     },
     {
       'target_name': 'jsapi',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
       ],
       'export_dependent_settings': [
         '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
@@ skipping 90 matching lines @@
         'testing/embedder_test.cpp',
         'testing/embedder_test.h',
         'testing/embedder_test_mock_delegate.h',
         'testing/embedder_test_timer_handling_delegate.h',
         'testing/fx_string_testhelpers.cpp',
         'testing/fx_string_testhelpers.h',
       ],
     },
   ],
 }