Loads CastEglPlatform implementation from shared library.

chromecast/ozone/ozone_platform_cast.h

Index: chromecast/ozone/ozone_platform_cast.h
diff --git a/chromecast/ozone/ozone_platform_cast.h b/chromecast/ozone/ozone_platform_cast.h
index eb936d102e44f845fb1bd89e1c307c517eea3103..e076e493ea8597698a982fe749d6f519ba63871e 100644
--- a/chromecast/ozone/ozone_platform_cast.h
+++ b/chromecast/ozone/ozone_platform_cast.h
@@ -10,10 +10,10 @@
 #include "ui/ozone/public/ozone_platform.h"
 
 namespace chromecast {
-namespace ozone {
-
 class CastEglPlatform;
 
+namespace ozone {
+
 // Ozone platform implementation for Cast.  Implements functionality
 // common to all Cast implementations:
 //  - Always one window with window size equal to display size