[flutter][deps][roller] Get rid of usage of deprecated FlatButton and
RaisedButton.

Change-Id: I37d5ebd38e026f008a60846875d1c7c25761e985
Reviewed-on: https://fuchsia-review.googlesource.com/c/topaz/+/474123
Commit-Queue: Naud Ghebre <naudzghebre@google.com>
Commit-Queue: Chase Latta <chaselatta@google.com>
Reviewed-by: Chase Latta <chaselatta@google.com>
diff --git a/public/dart/fuchsia_inspect/test/inspect_flutter_integration_tester/lib/src/inspect_integration_app.dart b/public/dart/fuchsia_inspect/test/inspect_flutter_integration_tester/lib/src/inspect_integration_app.dart
index f3b07df..17ce6c2 100644
--- a/public/dart/fuchsia_inspect/test/inspect_flutter_integration_tester/lib/src/inspect_integration_app.dart
+++ b/public/dart/fuchsia_inspect/test/inspect_flutter_integration_tester/lib/src/inspect_integration_app.dart
@@ -129,15 +129,15 @@
         buildProgramStateWidget(),
       ])),
       persistentFooterButtons: <Widget>[
-        FlatButton(
+        TextButton(
           onPressed: config4k,
           child: Text('Config 4k'),
         ),
-        FlatButton(
+        TextButton(
           onPressed: config16k,
           child: Text('Config 16k'),
         ),
-        FlatButton(
+        TextButton(
           onPressed: testInspectInstance,
           child: Text('Test Inspect Instance'),
         ),
diff --git a/public/dart/fuchsia_modular/examples/slider_mod/lib/src/widgets/value_slider.dart b/public/dart/fuchsia_modular/examples/slider_mod/lib/src/widgets/value_slider.dart
index 6e712e1..c4472dd 100644
--- a/public/dart/fuchsia_modular/examples/slider_mod/lib/src/widgets/value_slider.dart
+++ b/public/dart/fuchsia_modular/examples/slider_mod/lib/src/widgets/value_slider.dart
@@ -39,7 +39,7 @@
                 ],
               );
             }),
-        RaisedButton(
+        ElevatedButton(
           child: Text('Calc Fibonacci'),
           onPressed: () {
             _onCalcFibBtnPressed(sliderBloc);
diff --git a/public/dart/fuchsia_webview_flutter/examples/webview_mod/lib/app.dart b/public/dart/fuchsia_webview_flutter/examples/webview_mod/lib/app.dart
index 4936966..4c17666 100644
--- a/public/dart/fuchsia_webview_flutter/examples/webview_mod/lib/app.dart
+++ b/public/dart/fuchsia_webview_flutter/examples/webview_mod/lib/app.dart
@@ -107,11 +107,13 @@
   }
 
   Widget _buildCurrentBtn() {
-    return RaisedButton(
+    return ElevatedButton(
       child: const Text('Current'),
-      color: Theme.of(context).accentColor,
-      elevation: 4.0,
-      splashColor: Colors.blueGrey,
+      style: ElevatedButton.styleFrom(
+        primary: Theme.of(context).accentColor,
+        onPrimary: Colors.blueGrey,
+        elevation: 4.0,
+      ),
       onPressed: () {
         _webViewController.currentUrl().then((url) {
           _textEditingController.text = url;