Make BrowserMainParts have an empty implementation to make embedding easier.

ui/views/examples/content_client/examples_browser_main_parts.cc

Index: ui/views/examples/content_client/examples_browser_main_parts.cc
===================================================================
--- ui/views/examples/content_client/examples_browser_main_parts.cc	(revision 139582)
+++ ui/views/examples/content_client/examples_browser_main_parts.cc	(working copy)
@@ -46,22 +46,12 @@
 }  // namespace
 
 ExamplesBrowserMainParts::ExamplesBrowserMainParts(
-    const content::MainFunctionParams& parameters)
-    : BrowserMainParts() {
+    const content::MainFunctionParams& parameters) {
 }
 
 ExamplesBrowserMainParts::~ExamplesBrowserMainParts() {
 }
 
-#if !defined(OS_MACOSX)
-void ExamplesBrowserMainParts::PreMainMessageLoopStart() {
-}
-#endif
-
-int ExamplesBrowserMainParts::PreCreateThreads() {
-  return 0;
-}
-
 void ExamplesBrowserMainParts::PreMainMessageLoopRun() {
   browser_context_.reset(new content::ShellBrowserContext);