GN build for InputControllerTest

After https://codereview.chromium.org/802813002/

BUG=441856
R=spang
TEST=build

Review URL: https://codereview.chromium.org/809453002

Cr-Commit-Position: refs/heads/master@{#308387}

ui/ozone/platform/test/BUILD.gn

@@ -4,8 +4,6 @@
 
 source_set("test") {
   sources = [
-    "input_controller_test.cc",
-    "input_controller_test.h",
     "ozone_platform_test.cc",
     "ozone_platform_test.h",
     "test_window.cc",