Parse shmmax as a uint64

base/sys_info_linux.cc

Index: base/sys_info_linux.cc
diff --git a/base/sys_info_linux.cc b/base/sys_info_linux.cc
index eb89e5eb6d4cd4f75c19cb5da87300af7cd0904a..2e679ed39f3a52b7edc2b69d8ec5059575f9ed32 100644
--- a/base/sys_info_linux.cc
+++ b/base/sys_info_linux.cc
@@ -36,12 +36,11 @@ size_t MaxSharedMemorySize() {
     contents.erase(contents.length() - 1);
   }
 
-  int64 limit;
-  if (!base::StringToInt64(contents, &limit)) {
+  uint64 limit;
+  if (!base::StringToUint64(contents, &limit)) {
     limit = 0;
   }
-  if (limit < 0 ||
-      static_cast<uint64>(limit) > std::numeric_limits<size_t>::max()) {
+  if (limit > std::numeric_limits<size_t>::max()) {
     limit = 0;
   }
   DCHECK(limit > 0);