[Files app] Fixed unit test exif_parser_unittest

Passed to ExitParser's constructor an object that actually implements
the expected interface MetadataParserLogger.

Change-Id: Ifad809c2bed7d334c62fc4ecd1c244d5ef218c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1646795Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Auto-Submit: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666548}

ui/file_manager/file_manager/foreground/js/metadata/exif_parser_unittest.js

@@ -64,19 +64,35 @@ function writeDirectory_(bytes, tag) {
   byteWriter.checkResolved();
 }
 
+/**
+ * @implements {MetadataParserLogger}
+ * @final
+ */
+class ConsoleLogger {
+  constructor() {
+    this.verbose = true;
+  }
+
+  error(arg) {
+    console.error(arg);
+  }
+
+  log(arg) {
+    console.log(arg);
+  }
+
+  vlog(arg) {
+    console.log(arg);
+  }
+}
+
 /**
  * Parses exif data bytes (with logging) and returns the parsed tags.
  * @param {!TypedArray} bytes Bytes to be read.
  * @return {!Object<!Exif.Tag, !ExifEntry>} Tags.
  */
 function parseExifData_(bytes) {
-  let exifParser = new ExifParser(this);
-  exifParser.log = arg => {
-    console.log(arg);
-  };
-  exifParser.vlog = arg => {
-    console.log(arg);
-  };
+  const exifParser = new ExifParser(new ConsoleLogger());
 
   let tags = {};
   let byteReader = new ByteReader(bytes.buffer);