fix(Launcher): skip --disable-gpu flag on linux and mac platforms

Disabling GPU is no longer necessary on these platforms given the Chromium version installed by
puppeteer.

lib/Launcher.js

@@ -81,10 +81,14 @@ class Launcher {
     if (typeof options.headless !== 'boolean' || options.headless) {
       chromeArguments.push(
           '--headless',
-          '--disable-gpu',
           '--hide-scrollbars',
           '--mute-audio'
       );
+
+      // Do not add `--disable-gpu` for linux or macOS platforms when running headless.
+      // https://bugs.chromium.org/p/chromium/issues/detail?id=737678#c1
+      if (process.platform !== 'linux' && process.platform !== 'darwin')
+        chromeArguments.push('--disable-gpu');
     }
     let chromeExecutable = options.executablePath;
     if (typeof chromeExecutable !== 'string') {