Remove 'ADD_POPULAR_NETWORKS' feature flag (#15229)

.metamaskrc.dist

@@ -6,7 +6,6 @@ ONBOARDING_V2=
 SWAPS_USE_DEV_APIS=
 COLLECTIBLES_V1=
 TOKEN_DETECTION_V2=
-ADD_POPULAR_NETWORKS=
 
 ; Set this to test changes to the phishing warning page.
 PHISHING_WARNING_PAGE_URL=

development/build/scripts.js

@@ -36,7 +36,6 @@ const metamaskrc = require('rc')('metamask', {
   COLLECTIBLES_V1: process.env.COLLECTIBLES_V1,
   PHISHING_WARNING_PAGE_URL: process.env.PHISHING_WARNING_PAGE_URL,
   TOKEN_DETECTION_V2: process.env.TOKEN_DETECTION_V2,
-  ADD_POPULAR_NETWORKS: process.env.ADD_POPULAR_NETWORKS,
   SEGMENT_HOST: process.env.SEGMENT_HOST,
   SEGMENT_WRITE_KEY: process.env.SEGMENT_WRITE_KEY,
   SEGMENT_BETA_WRITE_KEY: process.env.SEGMENT_BETA_WRITE_KEY,
@@ -961,7 +960,6 @@ function getEnvironmentVariables({ buildType, devMode, testing, version }) {
     ONBOARDING_V2: metamaskrc.ONBOARDING_V2 === '1',
     COLLECTIBLES_V1: metamaskrc.COLLECTIBLES_V1 === '1',
     TOKEN_DETECTION_V2: metamaskrc.TOKEN_DETECTION_V2 === '1',
-    ADD_POPULAR_NETWORKS: metamaskrc.ADD_POPULAR_NETWORKS === '1',
   };
 }
 

ui/pages/settings/experimental-tab/experimental-tab.component.js

@@ -336,8 +336,7 @@ export default class ExperimentalTab extends PureComponent {
         {this.renderCollectibleDetectionToggle()}
         {this.renderEIP1559V2EnabledToggle()}
         {this.renderTheme()}
-        {process.env.ADD_POPULAR_NETWORKS &&
+        {this.renderCustomNetworkListToggle()}
-          this.renderCustomNetworkListToggle()}
       </div>
     );
   }