Keep browser process alive while there are platform apps with background pages running.

chrome/browser/extensions/platform_app_browsertest_util.h

Index: chrome/browser/extensions/platform_app_browsertest_util.h
diff --git a/chrome/browser/extensions/platform_app_browsertest_util.h b/chrome/browser/extensions/platform_app_browsertest_util.h
index 3d3a2a7d40efd36e9d4d74b9e443b0147b72f2b3..8c27400fbd81c514b44d38023b7fc57d682b5e82 100644
--- a/chrome/browser/extensions/platform_app_browsertest_util.h
+++ b/chrome/browser/extensions/platform_app_browsertest_util.h
@@ -24,6 +24,12 @@ class PlatformAppBrowserTest : public ExtensionApiTest {
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
 
  protected:
+  // Loads the app named |name| out of the platform_apps subdirectory.
+  const Extension* LoadPlatformApp(const char* name);
+
+  // Installs the app named |name| out of the platform_apps subdirectory.
+  const Extension* InstallPlatformApp(const char* name);
+
   // Runs the app named |name| out of the platform_apps subdirectory. Waits
   // until it is launched.
   const Extension* LoadAndLaunchPlatformApp(const char* name);
@@ -63,9 +69,6 @@ class PlatformAppBrowserTest : public ExtensionApiTest {
 
   // Creates an empty shell window for |extension|.
   ShellWindow* CreateShellWindow(const Extension* extension);
-
-  // Closes |window| and waits until it's gone.
-  void CloseShellWindow(ShellWindow* window);
 };
 
 }