Replace java_files with sources in //tools

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

TBR=wnwen@chromium.org

Bug: 1035074
Change-Id: I8a403ba2b72e76dd956072f4a5db80e4ea0f1e87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980873Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727202}

tools/android/audio_focus_grabber/BUILD.gn

@@ -15,7 +15,7 @@ android_apk("audio_focus_grabber_apk") {
     "//third_party/android_deps:com_android_support_support_compat_java",
   ]
 
-  java_files = [
+  sources = [
     "java/src/org/chromium/tools/audio_focus_grabber/AudioFocusGrabberActivity.java",
     "java/src/org/chromium/tools/audio_focus_grabber/AudioFocusGrabberListenerService.java",
   ]

tools/android/customtabs_benchmark/BUILD.gn

@@ -10,7 +10,7 @@ android_resources("customtabs_benchmark_apk_resources") {
 }
 
 android_apk("customtabs_benchmark_apk") {
-  java_files = [
+  sources = [
     "java/src/org/chromium/customtabs/test/MainActivity.java",
     "java/src/org/chromium/customtabs/test/WebViewActivity.java",
   ]

tools/android/errorprone_plugin/BUILD.gn

@@ -5,7 +5,7 @@
 import("//build/config/android/rules.gni")
 
 java_library("errorprone_plugin_java") {
-  java_files = [
+  sources = [
     # Turned off because of existing code which fails the check
     # "src/org/chromium/tools/errorprone/plugin/NoContextGetApplicationContext.java",
     "src/org/chromium/tools/errorprone/plugin/AndroidNullableCheck.java",

tools/android/kerberos/SpnegoAuthenticator/BUILD.gn

@@ -17,7 +17,7 @@ android_apk("spnego_authenticator_apk") {
     "//net/android:net_java",
   ]
 
-  java_files = [
+  sources = [
     "src/org/chromium/tools/spnegoauthenticator/AccountData.java",
     "src/org/chromium/tools/spnegoauthenticator/Constants.java",
     "src/org/chromium/tools/spnegoauthenticator/SpnegoAuthenticator.java",

tools/android/memconsumer/BUILD.gn

@@ -14,7 +14,7 @@ android_apk("memconsumer_apk") {
   android_manifest = "java/AndroidManifest.xml"
   min_sdk_version = 16
   target_sdk_version = 16
-  java_files = [
+  sources = [
     "java/src/org/chromium/memconsumer/MemConsumer.java",
     "java/src/org/chromium/memconsumer/ResidentService.java",
   ]

tools/android/push_apps_to_background/BUILD.gn

@@ -10,7 +10,9 @@ testonly = true
 
 android_apk("push_apps_to_background_apk") {
   apk_name = "PushAppsToBackground"
-  java_files = [ "src/org/chromium/push_apps_to_background/PushAppsToBackgroundActivity.java" ]
+  sources = [
+    "src/org/chromium/push_apps_to_background/PushAppsToBackgroundActivity.java",
+  ]
   android_manifest = "AndroidManifest.xml"
   deps = [
     ":push_apps_to_background_apk_resources",