WebUI: Enforce stricter TS ESLint checks for method names.

Achieved by enforcing 'strictCamelCase' format instead of just
'camelCase' in @typescript-eslint/naming-convention checks.

The stricter checks catch violations of the 'Abbreviations' section of
the styleguide at [1]like 'setPDF', or 'updateUIForViewportChange'.

All existing violations have been fixed in precursor CLs, after
uncovering them with the following command

`git cl presubmit --files=*.ts`

A couple new violations that were introduced within the last day are
being fixed directly in this CL.

[1] https://google.github.io/styleguide/tsguide.html#identifiers

Bug: 720034
Change-Id: I0c596f4d3934af1dd53b881275c6469f67de1592
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4083806
Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1081830}

.eslintrc.js

@@ -124,12 +124,12 @@ module.exports = {
         },
         {
           selector: 'classMethod',
-          format: ['camelCase'],
+          format: ['strictCamelCase'],
           modifiers: ['public'],
         },
         {
           selector: 'classMethod',
-          format: ['camelCase'],
+          format: ['strictCamelCase'],
           modifiers: ['private'],
           trailingUnderscore: 'allow',
         },

chrome/browser/resources/app_home/app_list.html

@@ -53,7 +53,7 @@
     </div>
     <cr-checkbox>Enable launching app on startup</cr-checkbox>
   </div>
-  <button class="dropdown-item" on-click="onCreateAShortcutItemClick_">
+  <button class="dropdown-item" on-click="onCreateShortcutItemClick_">
     Create a shortcut
   </button>
   <hr>

chrome/browser/resources/app_home/app_list.ts

@@ -109,7 +109,7 @@ export class AppListElement extends PolymerElement {
     this.$.menu.close();
   }
 
-  private onCreateAShortcutItemClick_() {
+  private onCreateShortcutItemClick_() {
     this.$.menu.close();
   }
 

chrome/browser/resources/chromeos/emoji_picker/emoji_picker.ts

@@ -136,7 +136,7 @@ export class EmojiPicker extends PolymerElement {
     };
   }
 
-  initHistoryUI(incognito: boolean) {
+  initHistoryUi(incognito: boolean) {
     if (incognito !== this.incognito) {
       this.updateIncognitoState(incognito);
     }
@@ -232,7 +232,7 @@ export class EmojiPicker extends PolymerElement {
                           this.setActiveFeatures(response.featureList)),
                   this.apiProxy.isIncognitoTextField().then(
                       (response: {incognito: boolean}) =>
-                          this.initHistoryUI(response.incognito)),
+                          this.initHistoryUi(response.incognito)),
                 ],
                 )
             .then(values => values[0]);  // Map to the fetched data only.