Create MetroViewerProcessHost as a common base for TestMetroViewerProcessHost and ChromeMetroViewer…

chrome/browser/browser_process_platform_part_aurawin.h

Index: chrome/browser/browser_process_platform_part_aurawin.h
diff --git a/chrome/browser/browser_process_platform_part_aurawin.h b/chrome/browser/browser_process_platform_part_aurawin.h
index b1b74a0ed3c8c6ddb6a182015125bb82f9be24d6..ef231c4b231f5adf9844018e81f5bd644f26a9bc 100644
--- a/chrome/browser/browser_process_platform_part_aurawin.h
+++ b/chrome/browser/browser_process_platform_part_aurawin.h
@@ -9,7 +9,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/browser_process_platform_part_base.h"
 
-class MetroViewerProcessHost;
+class ChromeMetroViewerProcessHost;
 
 class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase {
  public:
@@ -27,7 +27,7 @@ class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase {
  private:
   // Hosts the channel for the Windows 8 metro viewer process which runs in
   // the ASH environment.
-  scoped_ptr<MetroViewerProcessHost> metro_viewer_process_host_;
+  scoped_ptr<ChromeMetroViewerProcessHost> metro_viewer_process_host_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessPlatformPart);
 };