Move fetching logic out of ApplicationManager, eliminate url mappings.

mojo/runner/BUILD.gn

Index: mojo/runner/BUILD.gn
diff --git a/mojo/runner/BUILD.gn b/mojo/runner/BUILD.gn
index 132b53293b60e0515dd079eb2a4873f8dece9058..5b248d84611d9cc791681dbf21c1319dd1f00a5e 100644
--- a/mojo/runner/BUILD.gn
+++ b/mojo/runner/BUILD.gn
@@ -96,8 +96,6 @@ source_set("in_process_native_runner") {
 
 source_set("lib") {
   sources = [
-    "about_fetcher.cc",
-    "about_fetcher.h",
     "child_process.cc",
     "child_process.h",
     "child_process_host.cc",
@@ -112,8 +110,6 @@ source_set("lib") {
     "scoped_user_data_dir.h",
     "task_runners.cc",
     "task_runners.h",
-    "url_resolver.cc",
-    "url_resolver.h",
   ]
 
   deps = [
@@ -127,6 +123,7 @@ source_set("lib") {
     "//components/devtools_service/public/interfaces",
     "//mojo/application/public/cpp",
     "//mojo/common:tracing_impl",
+    "//mojo/fetcher",
     "//mojo/message_pump",
     "//mojo/services/network/public/interfaces",
     "//mojo/services/tracing/public/cpp",
@@ -419,7 +416,8 @@ mojom("child_process_bindings") {
 
 test("mojo_runner_unittests") {
   sources = [
-    "about_fetcher_unittest.cc",
+    "../fetcher/about_fetcher_unittest.cc",
+    "../fetcher/url_resolver_unittest.cc",
     "child_process_host_unittest.cc",
     "data_pipe_peek_unittest.cc",
     "in_process_native_runner_unittest.cc",
@@ -429,7 +427,6 @@ test("mojo_runner_unittests") {
     "shell_test_base_android.cc",
     "shell_test_base_unittest.cc",
     "shell_test_main.cc",
-    "url_resolver_unittest.cc",
   ]
 
   deps = [
@@ -441,6 +438,7 @@ test("mojo_runner_unittests") {
     "//mojo/application/public/cpp",
     "//mojo/common",
     "//mojo/environment:chromium",
+    "//mojo/fetcher",
     "//mojo/message_pump",
     "//mojo/services/test_service:bindings",
     "//mojo/shell",