[Chromecast] Clean up lint warnings in CastWebContents*

This fixes Java Errorprone warnings for:
  * deprecation
  * ReferenceEquality

Bug: Internal b/70158727
Test: build cast_shell_java, observe
      that lint warning is gone.

Change-Id: If72602773455c2c1903ca478ecb77baf4624e82a
Reviewed-on: https://chromium-review.googlesource.com/807150Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Simeon Anfinrud <sanfin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521552}

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWebContentsActivity.java

@@ -123,8 +123,8 @@ public class CastWebContentsActivity extends Activity {
     protected void handleIntent(Intent intent) {
         // Do not load the WebContents if we are simply bringing the same
         // activity to the foreground.
-        if (intent.getData() == null || mInstanceId == intent.getData().getPath()) {
-          return;
+        if (intent.getData() == null || mInstanceId.equals(intent.getData().getPath())) {
+            return;
         }
 
         intent.setExtrasClassLoader(WebContents.class.getClassLoader());
@@ -357,7 +357,7 @@ public class CastWebContentsActivity extends Activity {
         mHandler.postDelayed(new Runnable() {
             @Override
             public void run() {
-                if (currentInstanceId == mInstanceId) {
+                if (currentInstanceId.equals(mInstanceId)) {
                     Log.d(TAG, "Finishing.");
                     finish();
                 }

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWebContentsService.java

@@ -93,6 +93,9 @@ public class CastWebContentsService extends Service {
     }
 
     // Sets webContents to be the currently displayed webContents.
+    // TODO(thoren): Notification.Builder(Context) is deprecated in O. Use the (Context, String)
+    // constructor when CastWebContentsService starts supporting O.
+    @SuppressWarnings("deprecation")
     private void showWebContents(WebContents webContents) {
         if (DEBUG) Log.d(TAG, "showWebContents");