[Android] Call DevToolsServer.destroy where needed

android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java

Index: android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
diff --git a/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java b/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
index 3ed04908367701ab64df240f32a2bd753ac65927..deb0ccb92bc99529a7f9b16e9bb5f511f6c1381f 100644
--- a/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
+++ b/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
@@ -119,6 +119,15 @@ public class AwShellActivity extends Activity {
         }
     }
 
+    @Override
+    public void onDestroy() {
+        if (mDevToolsServer != null) {
+            mDevToolsServer.destroy();
+            mDevToolsServer = null;
+        }
+        super.onDestroy();
+    }
+
     private AwTestContainerView createAwTestContainerView() {
         AwBrowserProcess.start(this);
         AwTestContainerView testContainerView = new AwTestContainerView(this, true);