diff --git a/lib/updatePatches.js b/lib/updatePatches.js
index 9ceb0d843b21..f6937f60a46a 100644
--- a/lib/updatePatches.js
+++ b/lib/updatePatches.js
@@ -6,54 +6,9 @@ const util = require('../lib/util')
 const updatePatches = (options) => {
   config.update(options)
 
-  const runOptions = { cwd: config.projects.chrome.dir }
-  const patchDir = path.join(config.projects.antimuon.dir, 'patches')
-
-  console.log('updatePatches writing files to: ' + patchDir)
-
-  // grab Modified (and later Deleted) files but not Created (since we copy those)
-  const modifiedDiffArgs = ['diff', '--diff-filter=M', '--name-only', '--ignore-space-at-eol']
-  let modifiedDiff = util.run('git', modifiedDiffArgs, runOptions)
-  let moddedFileList = modifiedDiff.stdout.toString().split('\n').filter(s => s.length > 0)
-
-  let n = moddedFileList.length
-
-  // When splitting one large diff into a per-file diff, there are a few ways
-  // you can go about it. Because different files can have the same name
-  // (by being located in different directories), you need to avoid collisions.
-  // Mirroring the directory structure seems undesirable.
-  // Prefixing with numbers works but is O(n) volatile for O(1) additions
-  // We choose here to flatten the directory structure by replacing separators
-  // In practice this will avoid collisions. Should a pathological case ever
-  // appear, you can quickly patch this by changing the separator, even
-  // to something longer
-
-  const desiredReplacementSeparator = '-'
-  const patchExtension = '.patch'
-
-  for (var i = 0; i < n; i++) {
-    const old = moddedFileList[i]
-    let revised = old
-
-    //replacing forward slashes
-    //since git on Windows doesn't use backslashes, this is sufficient
-    revised = revised.replace(/\//g, desiredReplacementSeparator)
-
-    const singleDiffArgs = ['diff', '--src-prefix=a/', '--dst-prefix=b/', '--full-index', old]
-    let singleDiff = util.run('git', singleDiffArgs, runOptions)
-
-    const contents = singleDiff.stdout.toString()
-    const filename = revised + patchExtension
-
-    fs.writeFileSync(path.join(patchDir, filename), contents)
-
-    console.log('updatePatches wrote ' + (1 + i) + '/' + n + ': ' + filename)
-  }
-
-  // finish off by creating one big patch for deleted files
-  const deletedDiffArgs = ['diff', '--diff-filter=D', '--src-prefix=a/', '--dst-prefix=b/', '--full-index', '--ignore-space-at-eol']
-  let deletedDiff = util.run('git', deletedDiffArgs, runOptions)
-  fs.writeFileSync(path.join(patchDir, 'master_deleted_patch.patch'), deletedDiff.stdout)
+  const diffArgs = ['diff', '--full-index', '--ignore-space-at-eol']
+  let diff = util.run('git', diffArgs, { cwd: config.projects.chrome.dir })
+  fs.writeFileSync(path.join(config.projects.antimuon.dir, 'patches', 'master_patch.patch'), diff.stdout)
 }
 
 module.exports = updatePatches