macOS: Fix a bug in logic to get all memory regions.

The logic was accidentally double-counting the size of a memory region, causing
some memory regions to get skipped.

BUG=706547

Review-Url: https://codereview.chromium.org/2786733004
Cr-Commit-Position: refs/heads/master@{#460585}

components/tracing/common/process_metrics_memory_dump_provider.cc

@@ -430,7 +430,8 @@ bool GetAllRegions(std::vector<VMRegion>* regions) {
   vm_region_submap_info_64 info;
   natural_t depth = 1;
   mach_msg_type_number_t count = sizeof(info);
-  for (mach_vm_address_t address = MACH_VM_MIN_ADDRESS;; address += size) {
+  mach_vm_address_t address = MACH_VM_MIN_ADDRESS;
+  while (true) {
     memset(&info, 0, sizeof(info));
     kern_return_t kr = mach_vm_region_recurse(
         task, &address, &size, &depth,