Minimal athena shell main

apps/shell/browser/shell_browser_main_parts.cc

Index: apps/shell/browser/shell_browser_main_parts.cc
diff --git a/apps/shell/browser/shell_browser_main_parts.cc b/apps/shell/browser/shell_browser_main_parts.cc
index be1c82dc4d7ff153472becd2d2ce0649d92276bb..2bb594c5081c829183241e60d120b857247a1921 100644
--- a/apps/shell/browser/shell_browser_main_parts.cc
+++ b/apps/shell/browser/shell_browser_main_parts.cc
@@ -10,9 +10,6 @@
 #include "apps/shell/browser/shell_extension_system_factory.h"
 #include "apps/shell/browser/shell_extensions_browser_client.h"
 #include "apps/shell/common/shell_extensions_client.h"
-#include "base/command_line.h"
-#include "base/file_util.h"
-#include "base/files/file_path.h"
 #include "base/run_loop.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "content/public/common/result_codes.h"
@@ -47,10 +44,13 @@ void EnsureBrowserContextKeyedServiceFactoriesBuilt() {
 namespace apps {
 
 ShellBrowserMainParts::ShellBrowserMainParts(
-    const content::MainFunctionParams& parameters)
+    const content::MainFunctionParams& parameters,
+    StartCallback* start_callback)
     : extension_system_(NULL),
       parameters_(parameters),
-      run_message_loop_(true) {}
+      run_message_loop_(true),
+      start_callback_(start_callback) {
+}
 
 ShellBrowserMainParts::~ShellBrowserMainParts() {
 }
@@ -105,20 +105,13 @@ void ShellBrowserMainParts::PreMainMessageLoopRun() {
 
   devtools_delegate_.reset(
       new content::ShellDevToolsDelegate(browser_context_.get()));
-
-  const std::string kAppSwitch = "app";
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(kAppSwitch)) {
-    base::FilePath app_dir(command_line->GetSwitchValueNative(kAppSwitch));
-    base::FilePath app_absolute_dir = base::MakeAbsoluteFilePath(app_dir);
-    extension_system_->LoadAndLaunchApp(app_absolute_dir);
-  } else if (parameters_.ui_task) {
+  if (parameters_.ui_task) {
     // For running browser tests.
     parameters_.ui_task->Run();
     delete parameters_.ui_task;
     run_message_loop_ = false;
   } else {
-    LOG(ERROR) << "--" << kAppSwitch << " unset; boredom is in your future";
+    start_callback_->Run(browser_context_.get());
   }
 }