[DevTools] Move button 'clear site data' upward

Hoist this button upward so that a user no longer needs to scroll down
to find it if the console is docked at the lower half of the Application
panel, providing convenience and less confusion to first-time users.

Bug: 825132
Change-Id: I6808695c1c3e00d92553e221169b9d76a2791b2e
Reviewed-on: https://chromium-review.googlesource.com/c/1306412
Commit-Queue: Haihong Li (Harley) <hhli@chromium.org>
Reviewed-by: Erik Luo <luoe@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604429}

third_party/blink/renderer/devtools/front_end/resources/ClearStorageView.js

@@ -44,6 +44,10 @@ Resources.ClearStorageView = class extends UI.ThrottledWidget {
     usageBreakdownRow.appendChild(this._pieChart.element);
     usageBreakdownRow.appendChild(this._pieChartLegend);
 
+    const clearButtonSection = this._reportView.appendSection('', 'clear-storage-button').appendRow();
+    this._clearButton = UI.createTextButton(ls`Clear site data`, this._clear.bind(this));
+    clearButtonSection.appendChild(this._clearButton);
+
     const application = this._reportView.appendSection(Common.UIString('Application'));
     this._appendItem(application, Common.UIString('Unregister service workers'), 'service_workers');
 
@@ -58,10 +62,6 @@ Resources.ClearStorageView = class extends UI.ThrottledWidget {
     this._appendItem(caches, Common.UIString('Application cache'), 'appcache');
 
     SDK.targetManager.observeTargets(this, SDK.Target.Capability.Browser);
-    const footer = this._reportView.appendSection('', 'clear-storage-button').appendRow();
-    this._clearButton = UI.createTextButton(
-        Common.UIString('Clear site data'), this._clear.bind(this), Common.UIString('Clear site data'));
-    footer.appendChild(this._clearButton);
   }
 
   /**

third_party/blink/renderer/devtools/front_end/resources/clearStorageView.css

@@ -10,7 +10,7 @@
 }
 
 .clear-storage-button .report-row {
-    margin: 0 0 0 20px;
+    margin: 0 0 0 17px;
     display: flex;
 }