Fix WebApkInstallService::IsInstallInProgress() crash.

chrome/browser/android/webapk/webapk_install_service_factory.cc

Index: chrome/browser/android/webapk/webapk_install_service_factory.cc
diff --git a/chrome/browser/android/webapk/webapk_install_service_factory.cc b/chrome/browser/android/webapk/webapk_install_service_factory.cc
index 504532c479f52af1acd66fd027376f1c262dda14..779d06ea8a1d55191a02e583c950f6f6f9eb548f 100644
--- a/chrome/browser/android/webapk/webapk_install_service_factory.cc
+++ b/chrome/browser/android/webapk/webapk_install_service_factory.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/android/webapk/webapk_install_service_factory.h"
 
 #include "chrome/browser/android/webapk/webapk_install_service.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
@@ -30,3 +31,8 @@ KeyedService* WebApkInstallServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new WebApkInstallService(context);
 }
+
+content::BrowserContext* WebApkInstallServiceFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextRedirectedInIncognito(context);
+}