Moved WebView(ScrollView)Proxy files to ui subdirectory.

ios/web/BUILD.gn

Index: ios/web/BUILD.gn
diff --git a/ios/web/BUILD.gn b/ios/web/BUILD.gn
index 2c904e99a01be363b89421524153035d0f5e953f..58b9936b18da401cd056b87fff9084c75d2cea84 100644
--- a/ios/web/BUILD.gn
+++ b/ios/web/BUILD.gn
@@ -144,8 +144,6 @@ source_set("web_arc") {
     "public/web_state/context_menu_params.h",
     "public/web_state/credential.h",
     "public/web_state/crw_web_controller_observer.h",
-    "public/web_state/crw_web_view_proxy.h",
-    "public/web_state/crw_web_view_scroll_view_proxy.h",
     "public/web_state/global_web_state_observer.h",
     "public/web_state/js/credential_util.h",
     "public/web_state/js/crw_js_injection_evaluator.h",
@@ -161,6 +159,8 @@ source_set("web_arc") {
     "public/web_state/ui/crw_native_content_provider.h",
     "public/web_state/ui/crw_web_delegate.h",
     "public/web_state/ui/crw_web_view_content_view.h",
+    "public/web_state/ui/crw_web_view_proxy.h",
+    "public/web_state/ui/crw_web_view_scroll_view_proxy.h",
     "public/web_state/url_verification_constants.h",
     "public/web_state/web_state.h",
     "public/web_state/web_state_delegate.h",
@@ -188,9 +188,6 @@ source_set("web_arc") {
     "web_state/credential.cc",
     "web_state/crw_pass_kit_downloader.h",
     "web_state/crw_pass_kit_downloader.mm",
-    "web_state/crw_web_view_proxy_impl.h",
-    "web_state/crw_web_view_proxy_impl.mm",
-    "web_state/crw_web_view_scroll_view_proxy.mm",
     "web_state/error_translation_util.h",
     "web_state/error_translation_util.mm",
     "web_state/global_web_state_event_tracker.h",
@@ -217,6 +214,9 @@ source_set("web_arc") {
     "web_state/ui/crw_swipe_recognizer_provider.h",
     "web_state/ui/crw_touch_tracking_recognizer.h",
     "web_state/ui/crw_touch_tracking_recognizer.mm",
+    "web_state/ui/crw_web_view_proxy_impl.h",
+    "web_state/ui/crw_web_view_proxy_impl.mm",
+    "web_state/ui/crw_web_view_scroll_view_proxy.mm",
     "web_state/ui/crw_wk_navigation_states.h",
     "web_state/ui/crw_wk_navigation_states.mm",
     "web_thread_impl.cc",
@@ -566,7 +566,6 @@ test("ios_web_unittests") {
     "url_util_unittest.cc",
     "web_state/context_menu_params_utils_unittest.mm",
     "web_state/crw_pass_kit_downloader_unittest.mm",
-    "web_state/crw_web_view_scroll_view_proxy_unittest.mm",
     "web_state/error_translation_util_unittest.mm",
     "web_state/js/common_js_unittest.mm",
     "web_state/js/core_js_unittest.mm",
@@ -580,6 +579,7 @@ test("ios_web_unittests") {
     "web_state/ui/crw_web_controller_container_view_unittest.mm",
     "web_state/ui/crw_web_controller_observer_unittest.mm",
     "web_state/ui/crw_web_controller_unittest.mm",
+    "web_state/ui/crw_web_view_scroll_view_proxy_unittest.mm",
     "web_state/ui/crw_wk_navigation_states_unittest.mm",
     "web_state/ui/crw_wk_script_message_router_unittest.mm",
     "web_state/ui/web_view_js_utils_unittest.mm",