Get rid of custom npm installs.

Bazel should be pulling in all the necessary dependencies for testing.

Google-Bug-Id: b/244230014
Change-Id: I27b6aba4fbf6da506e6e34c53cb3982d93adb02e
diff --git a/jenkins-docker/agent-node-wct/Dockerfile b/jenkins-docker/agent-node-wct/Dockerfile
index c0dc506..c15da68 100644
--- a/jenkins-docker/agent-node-wct/Dockerfile
+++ b/jenkins-docker/agent-node-wct/Dockerfile
@@ -7,17 +7,3 @@
     echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
     apt-get update --allow-releaseinfo-change && apt-get install yarn
 
-COPY wct.conf.json /home/jenkins/
-RUN chown jenkins:jenkins /home/jenkins/wct.conf.json
-
-RUN npm install --unsafe-perm -g \
-      eslint@"=6.6.0" \
-      eslint-config-google@"=0.13.0" \
-      eslint-plugin-html@"=6.0.0" \
-      eslint-plugin-jsdoc@"=19.2.0" \
-      eslint-plugin-promise@"=4.0.1" \
-      typescript \
-      fried-twinkie@"^0.2.2" \
-      polylint polymer-cli \
-      @babel/runtime@"^7.13.9"
-RUN npm install --unsafe-perm -g 'web-component-tester@$WCT_VER'
diff --git a/jenkins-docker/agent-node-wct/wct.conf.json b/jenkins-docker/agent-node-wct/wct.conf.json
deleted file mode 100644
index 4158c03..0000000
--- a/jenkins-docker/agent-node-wct/wct.conf.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "verbose": true,
-  "plugins": {
-    "local": {
-      "browsers": ["chrome"]
-    }
-  }
-}