Restrict memory maps dump provider to only android and linux

base/trace_event/process_memory_maps_dump_provider.cc

Index: base/trace_event/process_memory_maps_dump_provider.cc
diff --git a/base/trace_event/process_memory_maps_dump_provider.cc b/base/trace_event/process_memory_maps_dump_provider.cc
index 335dd829ac578a70dc846718f210152c04a1cba2..5fb2bbb96af862b1ae10d37165d9a9e85c7e197f 100644
--- a/base/trace_event/process_memory_maps_dump_provider.cc
+++ b/base/trace_event/process_memory_maps_dump_provider.cc
@@ -13,7 +13,6 @@
 namespace base {
 namespace trace_event {
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
 // static
 FILE* ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = nullptr;
 
@@ -134,7 +133,6 @@ uint32 ReadLinuxProcSmapsFile(FILE* smaps_file, ProcessMemoryMaps* pmm) {
 }
 
 }  // namespace
-#endif  // defined(OS_LINUX) || defined(OS_ANDROID)
 
 // static
 ProcessMemoryMapsDumpProvider* ProcessMemoryMapsDumpProvider::GetInstance() {
@@ -157,23 +155,17 @@ bool ProcessMemoryMapsDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
     return true;
 
   uint32 res = 0;
-
-#if defined(OS_LINUX) || defined(OS_ANDROID)
   if (UNLIKELY(proc_smaps_for_testing)) {
     res = ReadLinuxProcSmapsFile(proc_smaps_for_testing, pmd->process_mmaps());
   } else {
     ScopedFILE smaps_file(fopen("/proc/self/smaps", "r"));
     res = ReadLinuxProcSmapsFile(smaps_file.get(), pmd->process_mmaps());
   }
-#else
-  LOG(ERROR) << "ProcessMemoryMaps dump provider is supported only on Linux";
-#endif
 
   if (res > 0) {
     pmd->set_has_process_mmaps();
     return true;
   }
-
   return false;
 }