Fix typos in BUILD.gn.

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")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
   include_dirs = [
@@ skipping 135 matching lines @@
   }
 }
 
 source_set("test_support") {
   testonly = true
   sources = [
     "testing/fx_string_testhelpers.cpp",
     "testing/fx_string_testhelpers.h",
     "testing/test_support.cpp",
     "testing/test_support.h",
-    'testing/utils/path_service.cpp',
+    "testing/utils/path_service.cpp",
   ]
   deps = [
     "//testing/gmock",
     "//testing/gtest",
     ":pdfium",
   ]
   include_dirs = []
   if (pdf_enable_v8) {
     deps += [
       "//v8",
@@ skipping 607 matching lines @@
       "//v8",
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
   }
   configs += [ ":pdfium_config" ]
 }