Rename fxjse/ to fxjs/ update files to match class names.

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_common_config") {
   cflags = []
@@ skipping 869 matching lines @@
       "fpdfsdk/fpdfxfa/include/fpdfxfa_util.h",
     ]
     deps = [
       ":xfa",
     ]
     configs += [ ":pdfium_core_config" ]
   }
 
   static_library("xfa") {
     sources = [
-      "fxjse/class.cpp",
-      "fxjse/context.cpp",
-      "fxjse/context.h",
-      "fxjse/dynprop.cpp",
-      "fxjse/include/cfxjse_arguments.h",
-      "fxjse/include/cfxjse_class.h",
-      "fxjse/include/cfxjse_value.h",
-      "fxjse/include/fxjse.h",
-      "fxjse/runtime.cpp",
-      "fxjse/runtime.h",
-      "fxjse/scope_inline.h",
-      "fxjse/value.cpp",
+      "fxjs/cfxjse_arguments.cpp",
+      "fxjs/cfxjse_class.cpp",
+      "fxjs/cfxjse_context.cpp",
+      "fxjs/cfxjse_isolatetracker.cpp",
+      "fxjs/cfxjse_isolatetracker.h",
+      "fxjs/cfxjse_runtimedata.cpp",
+      "fxjs/cfxjse_runtimedata.h",
+      "fxjs/cfxjse_value.cpp",
+      "fxjs/include/cfxjse_arguments.h",
+      "fxjs/include/cfxjse_class.h",
+      "fxjs/include/cfxjse_context.h",
+      "fxjs/include/cfxjse_value.h",
+      "fxjs/include/fxjse.h",
       "xfa/fde/cfde_path.cpp",
       "xfa/fde/cfde_path.h",
       "xfa/fde/cfde_txtedtbuf.cpp",
       "xfa/fde/cfde_txtedtbuf.h",
       "xfa/fde/cfde_txtedtbufiter.cpp",
       "xfa/fde/cfde_txtedtbufiter.h",
       "xfa/fde/cfde_txtedtdorecord_deleterange.cpp",
       "xfa/fde/cfde_txtedtdorecord_deleterange.h",
       "xfa/fde/cfde_txtedtdorecord_insert.cpp",
       "xfa/fde/cfde_txtedtdorecord_insert.h",
@@ skipping 661 matching lines @@
 }
 
 if (pdf_is_standalone) {
   source_set("samples") {
     testonly = true
     deps = [
       "//samples",
     ]
   }
 }