Reformat codebase into 2-spaces

This patch:
- reformats codebase to use 2-spaces instead of 4. This will
  align the project with other codebases (e.g. DevTools and Lighthouse)
- enables eslint indentation checking

References #19

.eslintrc.js

@@ -100,12 +100,11 @@ module.exports = {
         "no-trailing-spaces": 2,
         "linebreak-style": [ 2, "unix" ],
 
+        "indent": [2, 2, { "SwitchCase": 1, "CallExpression": {"arguments": 2}, "MemberExpression": 2 }],
         /**
          * Disabled, aspirational rules
          */
 
-        "indent": [0, 4, { "SwitchCase": 1, "CallExpression": {"arguments": 2}, "MemberExpression": 2 }],
-
         // brace-style is disabled, as eslint cannot enforce 1tbs as default, but allman for functions
         "brace-style": [0, "allman", { "allowSingleLine": true }],
 

install.js

@@ -23,9 +23,7 @@ if (Downloader.revisionInfo(Downloader.currentPlatform(), revision))
   return;
 
 Downloader.downloadRevision(Downloader.currentPlatform(), revision, onProgress)
-    .catch(error => {
-        console.error('Download failed: ' + error.message);
-    });
+    .catch(error => console.error('Download failed: ' + error.message));
 
 var progressBar = null;
 function onProgress(bytesTotal, delta) {

lib/helpers.js

@@ -15,7 +15,6 @@
  */
 
 module.exports = {
-
   /**
    * @param {function()} fun
    * @param {!Array<*>} args

yarn.lock

@@ -753,6 +753,10 @@ table@^4.0.1:
     slice-ansi "0.0.4"
     string-width "^2.0.0"
 
+text-diff@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/text-diff/-/text-diff-1.0.1.tgz#6c105905435e337857375c9d2f6ca63e453ff565"
+
 text-table@~0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"