Introduce content::RenderWidgetHostViewPort (in content/port/browser).

content/browser/tab_contents/tab_contents.cc

Index: content/browser/tab_contents/tab_contents.cc
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index 126019a7e7bb8c9af331ef6f0f4efd96b4791a72..64db85382a6e990aa875cfde254442dddf7b29e8 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -122,6 +122,7 @@ using content::NavigationEntry;
 using content::NavigationEntryImpl;
 using content::OpenURLParams;
 using content::RenderViewHostDelegate;
+using content::RenderWidgetHostViewPort;
 using content::SiteInstance;
 using content::SSLStatus;
 using content::UserMetricsAction;
@@ -292,7 +293,7 @@ TabContents::~TabContents() {
   if (GetNativeView()) {
     RenderViewHost* host = GetRenderViewHost();
     if (host && host->view())
-      RenderWidgetHostViewBase::FromRWHV(host->view())->WillWmDestroy();
+      RenderWidgetHostViewPort::FromRWHV(host->view())->WillWmDestroy();
   }
 #endif
 
@@ -761,8 +762,8 @@ void TabContents::NotifyNavigationStateChanged(unsigned changed_flags) {
 
 void TabContents::DidBecomeSelected() {
   controller_.SetActive(true);
-  RenderWidgetHostViewBase* rwhv =
-      RenderWidgetHostViewBase::FromRWHV(GetRenderWidgetHostView());
+  RenderWidgetHostViewPort* rwhv =
+      RenderWidgetHostViewPort::FromRWHV(GetRenderWidgetHostView());
   if (rwhv) {
     rwhv->DidBecomeSelected();
 #if defined(OS_MACOSX)
@@ -795,8 +796,8 @@ void TabContents::WasHidden() {
     // removes the |GetRenderViewHost()|; then when we actually destroy the
     // window, OnWindowPosChanged() notices and calls HideContents() (which
     // calls us).
-    RenderWidgetHostViewBase* rwhv =
-        RenderWidgetHostViewBase::FromRWHV(GetRenderWidgetHostView());
+    RenderWidgetHostViewPort* rwhv =
+        RenderWidgetHostViewPort::FromRWHV(GetRenderWidgetHostView());
     if (rwhv)
       rwhv->WasHidden();
   }
@@ -808,8 +809,8 @@ void TabContents::WasHidden() {
 }
 
 void TabContents::ShowContents() {
-  RenderWidgetHostViewBase* rwhv =
-      RenderWidgetHostViewBase::FromRWHV(GetRenderWidgetHostView());
+  RenderWidgetHostViewPort* rwhv =
+      RenderWidgetHostViewPort::FromRWHV(GetRenderWidgetHostView());
   if (rwhv)
     rwhv->DidBecomeSelected();
 }