Use suffixed {uint,int}{8,16,32,64}_t types.

webrtc/base/systeminfo.cc

Index: webrtc/base/systeminfo.cc
diff --git a/webrtc/base/systeminfo.cc b/webrtc/base/systeminfo.cc
index 540de82313e837fe884a9609833563e00d31f11a..bfc96b3763501214ee197ff65cf1edd4d8f5168c 100644
--- a/webrtc/base/systeminfo.cc
+++ b/webrtc/base/systeminfo.cc
@@ -161,8 +161,8 @@ std::string SystemInfo::GetCpuVendor() {
 
 // Returns the amount of installed physical memory in Bytes.  Cacheable.
 // Returns -1 on error.
-int64 SystemInfo::GetMemorySize() {
-  int64 memory = -1;
+int64_t SystemInfo::GetMemorySize() {
+  int64_t memory = -1;
 
 #if defined(WEBRTC_WIN)
   MEMORYSTATUSEX status = {0};
@@ -180,8 +180,8 @@ int64 SystemInfo::GetMemorySize() {
   if (error || memory == 0)
     memory = -1;
 #elif defined(WEBRTC_LINUX)
-  memory = static_cast<int64>(sysconf(_SC_PHYS_PAGES)) *
-      static_cast<int64>(sysconf(_SC_PAGESIZE));
+  memory = static_cast<int64_t>(sysconf(_SC_PHYS_PAGES)) *
+           static_cast<int64_t>(sysconf(_SC_PAGESIZE));
   if (memory < 0) {
     LOG(LS_WARNING) << "sysconf(_SC_PHYS_PAGES) failed."
                     << "sysconf(_SC_PHYS_PAGES) " << sysconf(_SC_PHYS_PAGES)