Move RenderViewHostObserver to content/public/browser/ and put it into the content namespace.

chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc

Index: chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc b/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
index dfdbe31f324663e782494a8d3f9398cafc38c75d..010cc359029d4b32d5134268382edf987fb5fa54 100644
--- a/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
@@ -32,9 +32,9 @@
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
-#include "content/browser/renderer_host/render_view_host_observer.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_view_host_observer.h"
 #include "googleurl/src/gurl.h"
 #include "grit/browser_resources.h"
 #include "grit/chromium_strings.h"
@@ -126,10 +126,10 @@ chromeos::CellularNetwork* GetCellularNetwork(
 
 // Observes IPC messages from the rederer and notifies JS if frame loading error
 // appears.
-class PortalFrameLoadObserver : public RenderViewHostObserver {
+class PortalFrameLoadObserver : public content::RenderViewHostObserver {
  public:
   PortalFrameLoadObserver(RenderViewHost* host, WebUI* webui)
-      : RenderViewHostObserver(host), webui_(webui) {
+      : content::RenderViewHostObserver(host), webui_(webui) {
     DCHECK(webui_);
     Send(new ChromeViewMsg_StartFrameSniffer(routing_id(),
                                              UTF8ToUTF16("paymentForm")));