Revert 171408

ppapi/proxy/serialized_structs.cc

Index: ppapi/proxy/serialized_structs.cc
diff --git a/ppapi/proxy/serialized_structs.cc b/ppapi/proxy/serialized_structs.cc
index 2ddf32599424f354f8bf3ed79c7b6cc348928c25..f83ae0b95c67e92ac42493c5fbd713235276e34c 100644
--- a/ppapi/proxy/serialized_structs.cc
+++ b/ppapi/proxy/serialized_structs.cc
@@ -107,17 +107,10 @@ SerializedHandle::SerializedHandle(
 }
 
 bool SerializedHandle::IsHandleValid() const {
-  switch (type_) {
-    case SHARED_MEMORY:
-      return base::SharedMemory::IsHandleValid(shm_handle_);
-    case SOCKET:
-    case CHANNEL_HANDLE:
-    case FILE:
-      return !(IPC::InvalidPlatformFileForTransit() == descriptor_);
-    case INVALID:
-      return false;
-    // No default so the compiler will warn us if a new type is added.
-  }
+  if (type_ == SHARED_MEMORY)
+    return base::SharedMemory::IsHandleValid(shm_handle_);
+  else if (type_ == SOCKET || type_ == CHANNEL_HANDLE)
+    return !(IPC::InvalidPlatformFileForTransit() == descriptor_);
   return false;
 }
 
@@ -132,7 +125,6 @@ void SerializedHandle::Close() {
         break;
       case SOCKET:
       case CHANNEL_HANDLE:
-      case FILE:
         base::PlatformFile file =
             IPC::PlatformFileForTransitToPlatformFile(descriptor_);
 #if !defined(OS_NACL)
@@ -176,7 +168,6 @@ bool SerializedHandle::ReadHeader(PickleIterator* iter, Header* hdr) {
     }
     case SOCKET:
     case CHANNEL_HANDLE:
-    case FILE:
     case INVALID:
       valid_type = true;
       break;