Remove obsolete cpp/mojom typemap for WebApplicationInfo

Bug: none
Change-Id: I9950f22a076ed0b5df43010c878d18372d5a6c69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629402Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843920}

chrome/common/BUILD.gn

@@ -772,21 +772,6 @@ mojom("mojo_bindings") {
   ]
 
   component_deps = [ "//content/public/common" ]
-
-  cpp_typemaps = [
-    {
-      types = [
-        {
-          mojom = "chrome.mojom.WebApplicationInfo"
-          cpp = "::WebApplicationInfo"
-        },
-      ]
-      traits_headers = [ "web_application_info.h" ]
-      traits_private_headers =
-          [ "web_application_info_provider_param_traits.h" ]
-      traits_deps = [ "//ipc" ]
-    },
-  ]
 }
 
 if (enable_print_preview && !is_chromeos_ash) {