cc: Rename cc classes and members to match filenames

cc/completion_event.h

Index: cc/completion_event.h
diff --git a/cc/completion_event.h b/cc/completion_event.h
index 795b0303323fb9db75f2444346e860107ecf2944..505baddfe0d60b86b966673bb0015d51a6deb8e5 100644
--- a/cc/completion_event.h
+++ b/cc/completion_event.h
@@ -14,9 +14,9 @@ namespace cc {
 // absolutely certain that doing-so will not lead to a deadlock.
 //
 // It is safe to destroy this object as soon as wait() returns.
-class CCCompletionEvent {
+class CompletionEvent {
 public:
-    CCCompletionEvent()
+    CompletionEvent()
         : m_event(false /* manual_reset */, false /* initially_signaled */)
     {
 #ifndef NDEBUG
@@ -25,7 +25,7 @@ public:
 #endif
     }
 
-    ~CCCompletionEvent()
+    ~CompletionEvent()
     {
         ASSERT(m_waited);
         ASSERT(m_signaled);