Mojo: Minor cleanup (of message_in_transit.cc and message_pipe.*).

mojo/system/message_in_transit.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SYSTEM_MESSAGE_IN_TRANSIT_H_
 #define MOJO_SYSTEM_MESSAGE_IN_TRANSIT_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 224 matching lines @@
 
   // Rounds |n| up to a multiple of |kMessageAlignment|.
   static inline size_t RoundUpMessageAlignment(size_t n) {
     return (n + kMessageAlignment - 1) & ~(kMessageAlignment - 1);
   }
 
  private:
   // To allow us to make assertions about |Header| in the .cc file.
   struct PrivateStructForCompileAsserts;
 
-  // "Header" for the data. Must be a multiple of |kMessageAlignment| bytes in
-  // size. Must be POD.
+  // Header for the data (main buffer). Must be a multiple of
+  // |kMessageAlignment| bytes in size. Must be POD.
   struct Header {
     // Total size of the message, including the header, the message data
     // ("bytes") including padding (to make it a multiple of |kMessageAlignment|
     // bytes), and serialized handle information. Note that this may not be the
     // correct value if dispatchers are attached but
     // |SerializeAndCloseDispatchers()| has not been called.
     uint32_t total_size;
     Type type;  // 2 bytes.
     Subtype subtype;  // 2 bytes.
     EndpointId source_id;  // 4 bytes.
@@ skipping 48 matching lines @@
   // TODO(vtl): With C++11, change it to a vector of |ScopedPlatformHandles|.
   scoped_ptr<std::vector<embedder::PlatformHandle> > platform_handles_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageInTransit);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_MESSAGE_IN_TRANSIT_H_