Replace java_files with sources in //device

Replace usages of java_files with sources in above directory's gn files,
and automatically format.

Bug: 1035074
Change-Id: I0599344d6f00b9a2668dc4fc8cb3b8acab50c819
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977195Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726653}

device/BUILD.gn

@@ -373,7 +373,7 @@ if (is_android) {
 
   android_library("bluetooth_test_java") {
     testonly = true
-    java_files = bluetooth_java_sources_needing_jni
+    sources = bluetooth_java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//components/location/android:location_java",
@@ -386,7 +386,9 @@ if (is_android) {
   }
 
   junit_binary("device_junit_tests") {
-    java_files = [ "gamepad/android/junit/src/org/chromium/device/gamepad/GamepadMappingsTest.java" ]
+    sources = [
+      "gamepad/android/junit/src/org/chromium/device/gamepad/GamepadMappingsTest.java",
+    ]
     deps = [
       "$google_play_services_package:google_play_services_base_java",
       "$google_play_services_package:google_play_services_basement_java",

device/bluetooth/BUILD.gn

@@ -525,7 +525,7 @@ if (is_android) {
   }
 
   android_library("java") {
-    java_files = java_sources_needing_jni
+    sources = java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//base:jni_java",

device/gamepad/BUILD.gn

@@ -177,7 +177,7 @@ if (is_android) {
   }
 
   android_library("java") {
-    java_files = [
+    sources = [
       "android/java/src/org/chromium/device/gamepad/GamepadDevice.java",
       "android/java/src/org/chromium/device/gamepad/GamepadList.java",
       "android/java/src/org/chromium/device/gamepad/GamepadMappings.java",

device/vr/BUILD.gn

@@ -389,7 +389,7 @@ if (enable_gvr_services) {
   }
 
   android_library("java") {
-    java_files = java_sources_needing_jni
+    sources = java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//base:jni_java",