Upgrade to muon 3.0.1

Auditors: @bsclifton
@bridiver FYI

.npmrc

@@ -1,7 +1,7 @@
 runtime = electron
 target_arch = x64
-brave_electron_version = 2.58.9
+brave_electron_version = 3.0.1
 chromedriver_version = 2.27
-target = v2.58.9
+target = v3.0.1
 disturl=http://brave-laptop-binaries.s3.amazonaws.com/atom-shell/dist/
 build_from_source = true

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## [0.15.300](https://github.com/brave/browser-laptop/releases/v0.15.300dev)
+ - Update muon to 3.0.1. ([#8445](https://github.com/brave/browser-laptop/issues/8445))
+
 ## [0.15.2](https://github.com/brave/browser-laptop/releases/v0.15.2dev)
  - Update libchromiumcontent to 58.0.3029.96. ([#8638](https://github.com/brave/browser-laptop/issues/8638))
  - Update muon to 2.58.9. ([#8660](https://github.com/brave/browser-laptop/issues/8660))

tools/cibuild.py

@@ -4,7 +4,7 @@
 import subprocess
 import sys
 import os.path
-MUON_VERSION = '2.58.9'
+MUON_VERSION = '3.0.1'
 CHROMEDRIVER_VERSION = '2.27'
 SOURCE_ROOT = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
 TARGET_ARCH= os.environ['TARGET_ARCH'] if os.environ.has_key('TARGET_ARCH') else 'x64'