[dPWA] Remove use of web_app:: in web_app namespace

This CL partially reverts:
https://chromium-review.googlesource.com/c/chromium/src/+/4632821

This CL keeps the move to put WebAppInstallInfo in the web_app
namespace but removes the changes to reference it as
web_app::WebAppInstallInfo from chrome/browser/web_applications
which is already in the web_app namespace.

Change-Id: I8d3eeb6335bfa4c7db8a9a19f05378b3917a14b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4645068
Commit-Queue: Glen Robertson <[email protected]>
Auto-Submit: Alan Cutter <[email protected]>
Reviewed-by: Glen Robertson <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1162241}
diff --git a/chrome/browser/web_applications/external_install_options.h b/chrome/browser/web_applications/external_install_options.h
index a592147..3d689c0e 100644
--- a/chrome/browser/web_applications/external_install_options.h
+++ b/chrome/browser/web_applications/external_install_options.h
@@ -25,7 +25,7 @@
 namespace web_app {
 
 using WebAppInstallInfoFactory =
-    base::RepeatingCallback<std::unique_ptr<web_app::WebAppInstallInfo>()>;
+    base::RepeatingCallback<std::unique_ptr<WebAppInstallInfo>()>;
 
 enum class ExternalInstallSource;
 
@@ -197,8 +197,8 @@
   // |service_worker_registration_url| will not be loaded.
   bool only_use_app_info_factory = false;
 
-  // A factory callback that returns a unique_ptr<web_app::WebAppInstallInfo> to
-  // be used as the app's installation metadata.
+  // A factory callback that returns a unique_ptr<WebAppInstallInfo> to be used
+  // as the app's installation metadata.
   WebAppInstallInfoFactory app_info_factory;
 
 #if BUILDFLAG(IS_CHROMEOS_ASH)