Replace java_files with sources in //c/b/ui

Replace usages of java_files with sources and automatically format:
chrome/browser/ui/messages/android/BUILD.gn

R=pavely

Bug: 1035074
Change-Id: I0d8fbc05a1c19fbf6b2892d8119697691e790f72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988725Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728616}

chrome/browser/ui/messages/android/BUILD.gn

@@ -14,11 +14,11 @@ android_resources("java_resources") {
 }
 
 android_library("java") {
-  java_files = [
-    "java/src/org/chromium/chrome/browser/ui/messages/snackbar/SnackbarView.java",
+  sources = [
     "java/src/org/chromium/chrome/browser/ui/messages/snackbar/Snackbar.java",
     "java/src/org/chromium/chrome/browser/ui/messages/snackbar/SnackbarCollection.java",
     "java/src/org/chromium/chrome/browser/ui/messages/snackbar/SnackbarManager.java",
+    "java/src/org/chromium/chrome/browser/ui/messages/snackbar/SnackbarView.java",
   ]
   deps = [
     ":java_resources",
@@ -62,6 +62,6 @@ android_library("javatests") {
     "//third_party/android_support_test_runner:rules_java",
     "//third_party/android_support_test_runner:runner_java",
     "//third_party/junit",
-    "//ui/android:ui_java_test_support"
+    "//ui/android:ui_java_test_support",
   ]
 }