Make RenderFrameHostManager swap RenderFrameHosts, not RenderViewHosts.

content/renderer/resource_fetcher_browsertest.cc

Index: content/renderer/resource_fetcher_browsertest.cc
diff --git a/content/renderer/resource_fetcher_browsertest.cc b/content/renderer/resource_fetcher_browsertest.cc
index a9498cb08232eab753c7ac97442dd39e050179a9..a1f1593b972308478aa67a8cc9890779a8d6cb23 100644
--- a/content/renderer/resource_fetcher_browsertest.cc
+++ b/content/renderer/resource_fetcher_browsertest.cc
@@ -25,6 +25,13 @@ using blink::WebFrame;
 using blink::WebURLRequest;
 using blink::WebURLResponse;
 
+namespace {
+
+// The first RenderFrame is routing ID 1, and the first RenderView is 2.
+const int kRenderViewRoutingId = 2;
+
+}
+
 namespace content {
 
 static const int kMaxWaitTimeMs = 5000;
@@ -135,7 +142,7 @@ class ResourceFetcherTests : public ContentBrowserTest {
   RenderView* GetRenderView() {
     // We could have the test on the UI thread get the WebContent's routing ID,
     // but we know this will be the first RV so skip that and just hardcode it.
-    return RenderView::FromRoutingID(1);
+    return RenderView::FromRoutingID(kRenderViewRoutingId);
   }
 
   void ResourceFetcherDownloadOnRenderer(const GURL& url) {