EDK: Move {platform_handle,scoped_platform_handle}.* to //mojo/edk/platform.

mojo/edk/system/connection_manager.h

Index: mojo/edk/system/connection_manager.h
diff --git a/mojo/edk/system/connection_manager.h b/mojo/edk/system/connection_manager.h
index 13d7584a29bd9d8d875a8a8f521e33c4651335c5..914dd716a489de38d97d4cc00542ed1f6512fb6d 100644
--- a/mojo/edk/system/connection_manager.h
+++ b/mojo/edk/system/connection_manager.h
@@ -16,6 +16,9 @@ namespace mojo {
 
 namespace embedder {
 class PlatformSupport;
+}  // namespace embedder
+
+namespace platform {
 class ScopedPlatformHandle;
 }  // namespace embedder
 
@@ -106,7 +109,7 @@ class ConnectionManager {
   virtual Result Connect(const ConnectionIdentifier& connection_id,
                          ProcessIdentifier* peer_process_identifier,
                          bool* is_first,
-                         embedder::ScopedPlatformHandle* platform_handle) = 0;
+                         platform::ScopedPlatformHandle* platform_handle) = 0;
 
  protected:
   // |platform_support| must be valid and remain alive until after |Shutdown()|