Replace java_files with sources in //testing

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

Bug: 1035074
Change-Id: I3a0a3131a57172a56787aec74c783fcd64fff94f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977149Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726681}

testing/android/broker/BUILD.gn

@@ -7,6 +7,7 @@ import("//build/config/android/rules.gni")
 android_library("broker_java") {
   chromium_code = true
 
-  java_files =
-      [ "java/src/org/chromium/test/broker/OnDeviceInstrumentationBroker.java" ]
+  sources = [
+    "java/src/org/chromium/test/broker/OnDeviceInstrumentationBroker.java",
+  ]
 }

testing/android/driver/BUILD.gn

@@ -16,6 +16,7 @@ android_apk("driver_apk") {
     "//testing/android/reporter:reporter_java",
   ]
 
-  java_files =
-      [ "java/src/org/chromium/test/driver/OnDeviceInstrumentationDriver.java" ]
+  sources = [
+    "java/src/org/chromium/test/driver/OnDeviceInstrumentationDriver.java",
+  ]
 }

testing/android/junit/BUILD.gn

@@ -10,7 +10,7 @@ java_library("junit_test_support") {
   # Skip platform checks since Robolectric depends on requires_android targets.
   bypass_platform_checks = true
   testonly = true
-  java_files = [
+  sources = [
     "java/src/org/chromium/testing/local/CustomShadowApplicationPackageManager.java",
     "java/src/org/chromium/testing/local/CustomShadowUserManager.java",
     "java/src/org/chromium/testing/local/GtestComputer.java",
@@ -34,7 +34,7 @@ java_library("junit_test_support") {
 }
 
 junit_binary("junit_unit_tests") {
-  java_files = [
+  sources = [
     "javatests/src/org/chromium/testing/local/GtestFilterTest.java",
     "javatests/src/org/chromium/testing/local/GtestLoggerTest.java",
     "javatests/src/org/chromium/testing/local/PackageFilterTest.java",

testing/android/native_test/BUILD.gn

@@ -48,7 +48,9 @@ source_set("native_test_native_code") {
 
 android_library("native_main_runner_java") {
   testonly = true
-  java_files = [ "java/src/org/chromium/native_test/MainRunner.java" ]
+  sources = [
+    "java/src/org/chromium/native_test/MainRunner.java",
+  ]
   deps = [
     "//base:base_java",
   ]
@@ -63,7 +65,7 @@ android_library("native_test_java") {
     "//testing/android/reporter:reporter_java",
     "//third_party/android_deps:android_support_v4_java",
   ]
-  java_files = [
+  sources = [
     "java/src/org/chromium/native_test/NativeBrowserTest.java",
     "java/src/org/chromium/native_test/NativeBrowserTestActivity.java",
     "java/src/org/chromium/native_test/NativeBrowserTestApplication.java",

testing/android/reporter/BUILD.gn

@@ -13,7 +13,7 @@ android_library("reporter_java") {
     "//third_party/android_sdk:android_test_base_java",
   ]
 
-  java_files = [
+  sources = [
     "java/src/org/chromium/test/reporter/TestStatusListener.java",
     "java/src/org/chromium/test/reporter/TestStatusReceiver.java",
     "java/src/org/chromium/test/reporter/TestStatusReporter.java",