Remove unnecessary casts on calls to findViewById

Just frameworks/ this time. More paths to come.

Bug: 24137209
Test: make -j32
Change-Id: Iff27abd26fa43296ac2fff8f534fc6742d2ae80c
diff --git a/samples/training/network-usage/src/com/example/android/networkusage/NetworkActivity.java b/samples/training/network-usage/src/com/example/android/networkusage/NetworkActivity.java
index b7ed331..27d230b 100644
--- a/samples/training/network-usage/src/com/example/android/networkusage/NetworkActivity.java
+++ b/samples/training/network-usage/src/com/example/android/networkusage/NetworkActivity.java
@@ -158,7 +158,7 @@
         setContentView(R.layout.main);
 
         // The specified network connection is not available. Displays error message.
-        WebView myWebView = (WebView) findViewById(R.id.webview);
+        WebView myWebView = findViewById(R.id.webview);
         myWebView.loadData(getResources().getString(R.string.connection_error),
                 "text/html", null);
     }
@@ -205,7 +205,7 @@
         protected void onPostExecute(String result) {
             setContentView(R.layout.main);
             // Displays the HTML string in the UI via a WebView
-            WebView myWebView = (WebView) findViewById(R.id.webview);
+            WebView myWebView = findViewById(R.id.webview);
             myWebView.loadData(result, "text/html", null);
         }
     }