[headless] Embed pak file into binary.

headless/lib/headless_content_main_delegate.cc

Index: headless/lib/headless_content_main_delegate.cc
diff --git a/headless/lib/headless_content_main_delegate.cc b/headless/lib/headless_content_main_delegate.cc
index e7ea8d7690d760ae8e03fd87614e2a57a6064215..2c590194fe71979d765f32790ea284fa39a9a903 100644
--- a/headless/lib/headless_content_main_delegate.cc
+++ b/headless/lib/headless_content_main_delegate.cc
@@ -10,6 +10,7 @@
 #include "base/trace_event/trace_event.h"
 #include "content/public/browser/browser_main_runner.h"
 #include "content/public/common/content_switches.h"
+#include "headless/embedded_resource_pak.h"
 #include "headless/lib/browser/headless_browser_impl.h"
 #include "headless/lib/browser/headless_content_browser_client.h"
 #include "headless/lib/renderer/headless_content_renderer_client.h"
@@ -96,11 +97,9 @@ HeadlessContentMainDelegate* HeadlessContentMainDelegate::GetInstance() {
 
 // static
 void HeadlessContentMainDelegate::InitializeResourceBundle() {
-  base::FilePath pak_file;
-  bool result = PathService::Get(base::DIR_MODULE, &pak_file);
-  DCHECK(result);
-  pak_file = pak_file.Append(FILE_PATH_LITERAL("headless_lib.pak"));
-  ui::ResourceBundle::InitSharedInstanceWithPakPath(pak_file);
+  ui::ResourceBundle::InitSharedInstanceWithPakBuffer(base::StringPiece(
+      reinterpret_cast<const char*>(kHeadlessResourcePak.contents),
+      kHeadlessResourcePak.length));
 }
 
 content::ContentBrowserClient*