Move platform abstraction to base library

src/lithium-allocator.cc

Index: src/lithium-allocator.cc
diff --git a/src/lithium-allocator.cc b/src/lithium-allocator.cc
index ad035752ef67874f94de370cdda0f4548428d2b9..3a9c2a3f8b5236f43652dac8231ad9e11e616910 100644
--- a/src/lithium-allocator.cc
+++ b/src/lithium-allocator.cc
@@ -1618,7 +1618,7 @@ void LAllocator::TraceAlloc(const char* msg, ...) {
   if (FLAG_trace_alloc) {
     va_list arguments;
     va_start(arguments, msg);
-    OS::VPrint(msg, arguments);
+    base::OS::VPrint(msg, arguments);
     va_end(arguments);
   }
 }
@@ -2192,7 +2192,7 @@ LAllocatorPhase::~LAllocatorPhase() {
   if (FLAG_hydrogen_stats) {
     unsigned size = allocator_->zone()->allocation_size() -
                     allocator_zone_start_allocation_size_;
-    isolate()->GetHStatistics()->SaveTiming(name(), TimeDelta(), size);
+    isolate()->GetHStatistics()->SaveTiming(name(), base::TimeDelta(), size);
   }
 
   if (ShouldProduceTraceOutput()) {