Fix a couple of gcc 4.8 warnings in tcmalloc.

third_party/tcmalloc/chromium/src/deep-heap-profile.cc

 // Copyright (c) 2012 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.
 
 // ---
 // Author: Sainbayar Sukhbaatar
 //         Dai Mikurube
 //
 
 #include "deep-heap-profile.h"
@@ skipping 109 matching lines @@
 #if defined(__linux__)
 
 void DeepHeapProfile::MemoryInfoGetterLinux::Initialize() {
   char filename[100];
   snprintf(filename, sizeof(filename), "/proc/%d/pagemap",
            static_cast<int>(getpid()));
   pagemap_fd_ = open(filename, O_RDONLY);
   RAW_CHECK(pagemap_fd_ != -1, "Failed to open /proc/self/pagemap");
 
   if (pageframe_type_ == DUMP_PAGECOUNT) {
-    snprintf(filename, sizeof(filename), "/proc/kpagecount",
-             static_cast<int>(getpid()));

[jar (doing other things), 2014/01/29 02:33:12]

This looks like a bug.  How about fixing it with a %d to print the pid?

[Dai Mikurube (NOT FULLTIME), 2014/01/29 03:24:13]

Ah, yes. It's my bug. Thanks for working on it, Sam.

It doesn't need pid since /proc/kpagecount is kernel-level memory info., not
process memory info.

sbc@'s fix is correct, but just using "/proc/kpagecount" directly in open()
might be better.

+    snprintf(filename, sizeof(filename), "/proc/kpagecount");
     kpagecount_fd_ = open(filename, O_RDONLY);
     if (kpagecount_fd_ == -1)
       RAW_LOG(0, "Failed to open /proc/kpagecount");
   }
 }
 
 size_t DeepHeapProfile::MemoryInfoGetterLinux::CommittedSize(
     uint64 first_address,
     uint64 last_address,
     DeepHeapProfile::TextBuffer* buffer) const {
@@ skipping 1011 matching lines @@
 DeepHeapProfile::~DeepHeapProfile() {
 }
 
 void DeepHeapProfile::DumpOrderedProfile(const char* reason,
                                          char raw_buffer[],
                                          int buffer_size,
                                          RawFD fd) {
 }
 
 #endif  // USE_DEEP_HEAP_PROFILE