fix more strict mode violation (#6937)

#no-changelog

Author: themiswang

firebase-crashlytics/src/main/java/com/google/firebase/crashlytics/internal/common/CommonUtils.java

@@ -139,8 +139,9 @@ static Architecture getValue() {
   public static String streamToString(InputStream is) {
     // Previous code was running into this: http://code.google.com/p/android/issues/detail?id=14562
     // on Android 2.3.3. The below code below does not exhibit that problem.
-    final java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
-    return s.hasNext() ? s.next() : "";
+    try (final java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A")) {
+      return s.hasNext() ? s.next() : "";
+    }
   }
 
   public static String sha1(String source) {

firebase-crashlytics/src/main/java/com/google/firebase/crashlytics/internal/common/CrashlyticsController.java

@@ -661,15 +661,15 @@ private InputStream getResourceAsStream(String resource) {
   }
 
   private static byte[] readResource(InputStream is) throws IOException {
-    ByteArrayOutputStream out = new ByteArrayOutputStream();
-    byte[] buffer = new byte[1024];
-    int length;
+    try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
+      byte[] buffer = new byte[1024];
+      int length;
 
-    while ((length = is.read(buffer)) != -1) {
-      out.write(buffer, 0, length);
+      while ((length = is.read(buffer)) != -1) {
+        out.write(buffer, 0, length);
+      }
+      return out.toByteArray();
     }
-
-    return out.toByteArray();
   }
 
   private void finalizePreviousNativeSession(String previousSessionId) {