Get rid of |get x(x)| pattern in tracing/

chrome/browser/resources/tracing/timeline_track.js

Index: chrome/browser/resources/tracing/timeline_track.js
diff --git a/chrome/browser/resources/tracing/timeline_track.js b/chrome/browser/resources/tracing/timeline_track.js
index 9e2d607ef718f83b54d0d6b392c351a7decaebdf..0d00b1e822c3630c3bd8a521c46e2fad0c9fe086 100644
--- a/chrome/browser/resources/tracing/timeline_track.js
+++ b/chrome/browser/resources/tracing/timeline_track.js
@@ -123,7 +123,7 @@ cr.define('tracing', function() {
       this.classList.add('timeline-thread-track');
     },
 
-    get thread(thread) {
+    get thread() {
       return this.thread_;
     },
 
@@ -212,7 +212,7 @@ cr.define('tracing', function() {
       this.classList.add('timeline-thread-track');
     },
 
-    get cpu(cpu) {
+    get cpu() {
       return this.cpu_;
     },