Fix build after previous commit.

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.
 
 pdf_use_skia = false
 
 config("pdfium_config") {
   cflags = []
   defines = [
     "_FXFT_VERSION_=2501",
@@ skipping 612 matching lines @@
     "core/src/fxge/fx_freetype/src/fxft_raster.c",
     "core/src/fxge/fx_freetype/src/fxft_sfnt.c",
     "core/src/fxge/fx_freetype/src/fxft_smooth.c",
     "core/src/fxge/fx_freetype/src/fxft_truetype.c",
     "core/src/fxge/fx_freetype/src/fxft_type1.c",
     "core/src/fxge/fx_freetype/src/fxft_type1cid.c",
     "core/src/fxge/ge/fx_ge.cpp",
     "core/src/fxge/ge/fx_ge_device.cpp",
     "core/src/fxge/ge/fx_ge_font.cpp",
     "core/src/fxge/ge/fx_ge_fontmap.cpp",
+    "core/src/fxge/ge/fx_ge_linux.cpp",
     "core/src/fxge/ge/fx_ge_path.cpp",
     "core/src/fxge/ge/fx_ge_ps.cpp",
     "core/src/fxge/ge/fx_ge_text.cpp",
     "core/src/fxge/ge/text_int.h",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ ":pdfium_config", "//build/config/compiler:no_chromium_code" ]
 
   if (pdf_use_skia) {
@@ skipping 190 matching lines @@
     "fpdfsdk/src/formfiller/FFL_ListBox.cpp",
     "fpdfsdk/src/formfiller/FFL_Notify.cpp",
     "fpdfsdk/src/formfiller/FFL_PushButton.cpp",
     "fpdfsdk/src/formfiller/FFL_RadioButton.cpp",
     "fpdfsdk/src/formfiller/FFL_TextField.cpp",
     "fpdfsdk/src/formfiller/FFL_Utils.cpp",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ ":pdfium_config", "//build/config/compiler:no_chromium_code" ]
 }