Mojo: COMPILE_ASSERT -> static_assert in mojo/system and mojo/embedder.

mojo/system/local_data_pipe_unittest.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.
 
 #include "mojo/system/local_data_pipe.h"
 
 #include <string.h>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 1356 matching lines @@
   // Try writing way too much (two-phase).
   uint32_t num_bytes = 20u * sizeof(int32_t);
   void* write_ptr = nullptr;
   EXPECT_EQ(
       MOJO_RESULT_OUT_OF_RANGE,
       dp->ProducerBeginWriteData(
           MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
 
   // Try writing an amount which isn't a multiple of the element size
   // (two-phase).
-  COMPILE_ASSERT(sizeof(int32_t) > 1u, wow_int32_ts_have_size_1);
+  static_assert(sizeof(int32_t) > 1u, "Wow! int32_t's have size 1");
   num_bytes = 1u;
   write_ptr = nullptr;
   EXPECT_EQ(
       MOJO_RESULT_INVALID_ARGUMENT,
       dp->ProducerBeginWriteData(
           MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
 
   // Try reading way too much (two-phase).
   num_bytes = 20u * sizeof(int32_t);
   const void* read_ptr = nullptr;
@@ skipping 606 matching lines @@
   // End reading.
   EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(2u));
 
   dp->ProducerClose();
   dp->ConsumerClose();
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo