Update some uses of char16 to use the base:: namespace.

sandbox/win/src/handle_closer_agent.cc

Index: sandbox/win/src/handle_closer_agent.cc
diff --git a/sandbox/win/src/handle_closer_agent.cc b/sandbox/win/src/handle_closer_agent.cc
index bc75e7322b2bf1a8c884196df569d530193ebd75..97dfb17efe4c71621e3289d8a228dfbec199003d 100644
--- a/sandbox/win/src/handle_closer_agent.cc
+++ b/sandbox/win/src/handle_closer_agent.cc
@@ -49,9 +49,9 @@ void HandleCloserAgent::InitializeHandlesToClose() {
   HandleListEntry* entry = g_handles_to_close->handle_entries;
   for (size_t i = 0; i < g_handles_to_close->num_handle_types; ++i) {
     // Set the type name.
-    char16* input = entry->handle_type;
+    base::char16* input = entry->handle_type;
     HandleMap::mapped_type& handle_names = handles_to_close_[input];
-    input = reinterpret_cast<char16*>(reinterpret_cast<char*>(entry)
+    input = reinterpret_cast<base::char16*>(reinterpret_cast<char*>(entry)
         + entry->offset_to_names);
     // Grab all the handle names.
     for (size_t j = 0; j < entry->name_count; ++j) {
@@ -65,9 +65,9 @@ void HandleCloserAgent::InitializeHandlesToClose() {
     entry = reinterpret_cast<HandleListEntry*>(reinterpret_cast<char*>(entry)
         + entry->record_bytes);
 
-    DCHECK(reinterpret_cast<char16*>(entry) >= input);
-    DCHECK(reinterpret_cast<char16*>(entry) - input <
-           sizeof(size_t) / sizeof(char16));
+    DCHECK(reinterpret_cast<base::char16*>(entry) >= input);
+    DCHECK(reinterpret_cast<base::char16*>(entry) - input <
+           sizeof(size_t) / sizeof(base::char16));
   }
 
   // Clean up the memory we copied over.