Chrome Version       : 69.0.3497.81（Official Build)(64Bit)
URLs (if applicable) : N/A
OS                   : MacPro El Capitan 10.11.6
Node.js              : 8.11.2
npm                  : 5.6.0
Other browsers tested: N/A


What steps will reproduce the problem?
Using puppeteer(https://github.com/GoogleChrome/puppeteer) as framework for automation.
`input` command fails on Japanses characters

```
		await page.waitFor('input.selector');
    await page.focus('input.selector');
    await page.type('input.selector', 'あいうえお'); <<<<<<
```

What is the expected result?
Expected to type Japanese character(s)

What happens instead?
Failed to type Japanese character(s)


Stacktrace........

```
(node:8365) UnhandledPromiseRejectionWarning: Error: Protocol error (Input.insertText): 'Input.insertText' wasn't found
    at Promise (/Users/uu091430/project/jbg-ga/app/node_modules/puppeteer/lib/Connection.js:203:56)
    at new Promise (<anonymous>)
    at CDPSession.send (/Users/uu091430/project/jbg-ga/app/node_modules/puppeteer/lib/Connection.js:202:12)
    at Keyboard.sendCharacter (/Users/uu091430/project/jbg-ga/app/node_modules/puppeteer/lib/Input.js:151:24)
    at Keyboard.type (/Users/uu091430/project/jbg-ga/app/node_modules/puppeteer/lib/Input.js:166:20)
    at ElementHandle.type (/Users/uu091430/project/jbg-ga/app/node_modules/puppeteer/lib/ExecutionContext.js:413:31)
    at <anonymous>
  writeOut
  output
  process.on
  emitOne
  emit
  (anonymous function)
  _combinedTickCallback
  _tickCallback
(node:8365) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
  writeOut
  output
  process.on
  emitOne
  emit
  (anonymous function)
  _combinedTickCallback
  _tickCallback
(node:8365) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
  writeOut
  output
  process.on
  emitOne
  emit
  (anonymous function)
  _combinedTickCallback
  _tickCallback

  ````