Handle the possibility of unexpected logs.

spec/api-web-contents-spec.js

@@ -671,8 +671,10 @@ describe('webContents module', () => {
   describe('console-message event', () => {
     it('is triggered with correct log message', (done) => {
       w.webContents.on('console-message', (e, level, message) => {
-        assert.equal(message, 'a')
-        done()
+        // Don't just assert as Chromium might emit other logs that we should ignore.
+        if (message === 'a') {
+          done()
+        }
       })
       w.loadURL(`file://${fixtures}/pages/a.html`)
     })