mojo: Make InterfacePtr<> testable in if() statements without .get().

mojo/system/local_data_pipe.cc

 // 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.
 
 // TODO(vtl): I currently potentially overflow in doing index calculations.
 // E.g., |start_index_| and |current_num_bytes_| fit into a |uint32_t|, but
 // their sum may not. This is bad and poses a security risk. (We're currently
 // saved by the limit on capacity -- the maximum size of the buffer, checked in
 // |DataPipe::ValidateOptions()|, is currently sufficiently small.
 
@@ skipping 269 matching lines @@
       rv.satisfied_signals |= MOJO_HANDLE_SIGNAL_READABLE;
     rv.satisfiable_signals |= MOJO_HANDLE_SIGNAL_READABLE;
   } else if (producer_open_no_lock()) {
     rv.satisfiable_signals |= MOJO_HANDLE_SIGNAL_READABLE;
   }
   return rv;
 }
 
 void LocalDataPipe::EnsureBufferNoLock() {
   DCHECK(producer_open_no_lock());
-  if (buffer_.get())
+  if (buffer_)
     return;
   buffer_.reset(static_cast<char*>(
       base::AlignedAlloc(capacity_num_bytes(), kDataPipeBufferAlignmentBytes)));
 }
 
 void LocalDataPipe::DestroyBufferNoLock() {
 #ifndef NDEBUG
   // Scribble on the buffer to help detect use-after-frees. (This also helps the
   // unit test detect certain bugs without needing ASAN or similar.)
-  if (buffer_.get())
+  if (buffer_)
     memset(buffer_.get(), 0xcd, capacity_num_bytes());
 #endif
   buffer_.reset();
 }
 
 size_t LocalDataPipe::GetMaxNumBytesToWriteNoLock() {
   size_t next_index = start_index_ + current_num_bytes_;
   if (next_index >= capacity_num_bytes()) {
     next_index %= capacity_num_bytes();
     DCHECK_GE(start_index_, next_index);
@@ skipping 12 matching lines @@
 
 void LocalDataPipe::MarkDataAsConsumedNoLock(size_t num_bytes) {
   DCHECK_LE(num_bytes, current_num_bytes_);
   start_index_ += num_bytes;
   start_index_ %= capacity_num_bytes();
   current_num_bytes_ -= num_bytes;
 }
 
 }  // namespace system
 }  // namespace mojo