[chromecast] Delete unnecessary null check for RenderView::GetWebView().

A content::RenderView should always have a valid blink::WebView if it is
observable by non-content internal code.

Change-Id: I4afd471b5b46e16865c5b46d3bbdc23a06b7f95a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131246Reviewed-by: Sean Topping <seantopping@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755419}

chromecast/renderer/cast_content_renderer_client.cc

@@ -166,13 +166,11 @@ void CastContentRendererClient::RenderThreadStarted() {
 void CastContentRendererClient::RenderViewCreated(
     content::RenderView* render_view) {
   blink::WebView* webview = render_view->GetWebView();
-  if (webview) {
-    webview->SetBaseBackgroundColor(chromecast::GetSwitchValueColor(
-        switches::kCastAppBackgroundColor, SK_ColorBLACK));
-    // Disable application cache as Chromecast doesn't support off-line
-    // application running.
-    webview->GetSettings()->SetOfflineWebApplicationCacheEnabled(false);
-  }
+  webview->SetBaseBackgroundColor(chromecast::GetSwitchValueColor(
+      switches::kCastAppBackgroundColor, SK_ColorBLACK));
+  // Disable application cache as Chromecast doesn't support off-line
+  // application running.
+  webview->GetSettings()->SetOfflineWebApplicationCacheEnabled(false);
 }
 
 void CastContentRendererClient::RenderFrameCreated(