Adding error handlers to setup.exe

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 2cb2f6dc586dbb0b53c6e7cb0b5e6f7be98b238b..cfd65620ee5786166ce05d82573079867199475a 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -1190,6 +1190,17 @@ if (is_win) {
       "//build/config/sanitizers:deps",
     ]
   }
+
+  source_set("process_startup_helper_win") {
+    sources = [
+      "win/process_startup_helper.cc",
+      "win/process_startup_helper.h",
+    ]
+    deps = [
+      "//base",
+      "//base:base_static",
+    ]
+  }
 }
 
 # TODO(GYP): Delete this after we've converted everything to GN.