Move StringPiece into the base namespace. It is colliding

base/debug_util_posix.cc

 // Copyright (c) 2006-2009 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 "build/build_config.h"
 #include "base/debug_util.h"
 
 #include <errno.h>
 #include <execinfo.h>
 #include <fcntl.h>
@@ skipping 74 matching lines @@
   // read this much all at once.  In practice this will generally be true.
   // This simplifies and speeds up things considerably.
   char buf[1024];
 
   ssize_t num_read = HANDLE_EINTR(read(status_fd, buf, sizeof(buf)));
   HANDLE_EINTR(close(status_fd));
 
   if (num_read <= 0)
     return false;
 
-  StringPiece status(buf, num_read);
-  StringPiece tracer("TracerPid:\t");
+  base::StringPiece status(buf, num_read);
+  base::StringPiece tracer("TracerPid:\t");
 
-  StringPiece::size_type pid_index = status.find(tracer);
-  if (pid_index == StringPiece::npos)
+  base::StringPiece::size_type pid_index = status.find(tracer);
+  if (pid_index == base::StringPiece::npos)
     return false;
 
   // Our pid is 0 without a debugger, assume this for any pid starting with 0.
   pid_index += tracer.size();
   return pid_index < status.size() && status[pid_index] != '0';
 }
 
 #endif  // OS_LINUX
 
 // static
@@ skipping 27 matching lines @@
     for (int i = 0; i < count_; ++i) {
       (*os) << "\t" << trace_[i] << "\n";
     }
   } else {
     (*os) << "Backtrace:\n";
     for (int i = 0; i < count_; ++i) {
       (*os) << "\t" << trace_symbols.get()[i] << "\n";
     }
   }
 }