Move platform abstraction to base library

test/cctest/test-code-stubs-x87.cc

Index: test/cctest/test-code-stubs-x87.cc
diff --git a/test/cctest/test-code-stubs-x87.cc b/test/cctest/test-code-stubs-x87.cc
index 3d23d0b847c0c632b4c5a0798531c938fd32e4d7..0b4a8d417bccd1e998c20a8c49669bf6cf6e8ba5 100644
--- a/test/cctest/test-code-stubs-x87.cc
+++ b/test/cctest/test-code-stubs-x87.cc
@@ -31,10 +31,10 @@
 
 #include "src/v8.h"
 
+#include "src/base/platform/platform.h"
 #include "src/code-stubs.h"
 #include "src/factory.h"
 #include "src/macro-assembler.h"
-#include "src/platform.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/test-code-stubs.h"
 
@@ -47,9 +47,8 @@ ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                               Register destination_reg) {
   // Allocate an executable page of memory.
   size_t actual_size;
-  byte* buffer = static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize,
-                                                   &actual_size,
-                                                   true));
+  byte* buffer = static_cast<byte*>(v8::base::OS::Allocate(
+      Assembler::kMinimalBufferSize, &actual_size, true));
   CHECK(buffer);
   HandleScope handles(isolate);
   MacroAssembler assm(isolate, buffer, static_cast<int>(actual_size));