Remove whitespace at the end of the package.json lines

json.dump appears to add extraneous spaces before newline characters. By
specifying the separators option, we can remove these whitespaces,
reducing the diff noise. Solution taken from
https://stackoverflow.com/questions/16311562/python-json-without-whitespaces

DISABLE_THIRD_PARTY_CHECK=Fix whitespace in node_modules

Change-Id: I26556e5053f19a9021ad41779319bdfe3f8c2b6c
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2013154
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>

node_modules/flat/package.json

@@ -1,39 +1,39 @@
 {
-  "author": "Hugh Kennedy <hughskennedy@gmail.com> (http://hughskennedy.com)", 
-  "bin": "cli.js", 
+  "author": "Hugh Kennedy <hughskennedy@gmail.com> (http://hughskennedy.com)",
+  "bin": "cli.js",
   "bugs": {
     "url": "https://github.com/hughsk/flat/issues"
-  }, 
+  },
   "dependencies": {
     "is-buffer": "~2.0.3"
-  }, 
-  "description": "Take a nested Javascript object and flatten it, or unflatten an object with delimited keys", 
+  },
+  "description": "Take a nested Javascript object and flatten it, or unflatten an object with delimited keys",
   "devDependencies": {
-    "mocha": "~5.2.0", 
+    "mocha": "~5.2.0",
     "standard": "^11.0.1"
-  }, 
+  },
   "directories": {
     "test": "test"
-  }, 
-  "homepage": "https://github.com/hughsk/flat", 
+  },
+  "homepage": "https://github.com/hughsk/flat",
   "keywords": [
-    "flat", 
-    "json", 
-    "flatten", 
-    "unflatten", 
-    "split", 
-    "object", 
+    "flat",
+    "json",
+    "flatten",
+    "unflatten",
+    "split",
+    "object",
     "nested"
-  ], 
-  "license": "BSD-3-Clause", 
-  "main": "index.js", 
-  "name": "flat", 
+  ],
+  "license": "BSD-3-Clause",
+  "main": "index.js",
+  "name": "flat",
   "repository": {
-    "type": "git", 
+    "type": "git",
     "url": "git://github.com/hughsk/flat.git"
-  }, 
+  },
   "scripts": {
     "test": "mocha -u tdd --reporter spec && standard index.js test/index.js"
-  }, 
+  },
   "version": "4.1.0"
 }