Fix MSVC build (including on 2015), drop some workarounds for MSVC older than 2013.

src/processor/proc_maps_linux.cc

 // Copyright (c) 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 __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
 #endif
 
 #include "google_breakpad/processor/proc_maps_linux.h"
 
@@ skipping 16 matching lines @@
 
 bool ParseProcMaps(const std::string& input,
                    std::vector<MappedMemoryRegion>* regions_out) {
   std::vector<MappedMemoryRegion> regions;
 
   // This isn't async safe nor terribly efficient, but it doesn't need to be at
   // this point in time.
 
   // Split the string by newlines.
   std::vector<std::string> lines;
-  std::string line = "";
+  std::string l = "";
   for (size_t i = 0; i < input.size(); i++) {
     if (input[i] != '\n' && input[i] != '\r') {
-      line.push_back(input[i]);
-    } else if (line.size() > 0) {
-      lines.push_back(line);
-      line.clear();
+      l.push_back(input[i]);
+    } else if (l.size() > 0) {
+      lines.push_back(l);
+      l.clear();
     }
   }
-  if (line.size() > 0) {
+  if (l.size() > 0) {
     BPLOG(ERROR) << "Input doesn't end in newline";
     return false;
   }
 
   for (size_t i = 0; i < lines.size(); ++i) {
     MappedMemoryRegion region;
     const char* line = lines[i].c_str();
     char permissions[5] = {'\0'};  // Ensure NUL-terminated string.
     int path_index = 0;
 
@@ skipping 39 matching lines @@
     regions.push_back(region);
     regions.back().path.assign(line + path_index);
     regions.back().line.assign(line);
   }
 
   regions_out->swap(regions);
   return true;
 }
 
 }  // namespace google_breakpad