Build: remove global install of latest npm since we want to use the p…

…aired node/npm version (#17134)

* Build: remove global install of latest npm since we want to use the paired node/npm version
* Also update travis to remove --latest-npm flag

.travis.yml

@@ -23,7 +23,7 @@ branches:
     - master
 
 before_install:
-  - nvm install --latest-npm
+  - nvm install
 
 env: PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
 

bin/install-node-nvm.sh

@@ -69,9 +69,6 @@ fi
 echo -e $(status_message "Installing and updating NPM packages..." )
 npm install
 
-# Make sure npm is up-to-date
-npm install npm -g
-
 # There was a bug in NPM that caused changes in package-lock.json. Handle that.
 if [ "$TRAVIS" != "true" ] && ! git diff --no-ext-diff --exit-code package-lock.json >/dev/null; then
 	if ask "$(warning_message "Your package-lock.json changed, which may mean there's an issue with your NPM cache. Would you like to try and automatically clean it up?" )" N 10; then