Move platform abstraction to base library

test/cctest/test-platform-win32.cc

Index: test/cctest/test-platform-win32.cc
diff --git a/test/cctest/test-platform-win32.cc b/test/cctest/test-platform-win32.cc
index 83ee1b3846447efa9563a0e2f37cbb66cb6bbbac..626c37799eccd08b5ac5a5c41a1b9dc1f5139941 100644
--- a/test/cctest/test-platform-win32.cc
+++ b/test/cctest/test-platform-win32.cc
@@ -31,8 +31,8 @@
 
 #include "src/v8.h"
 
+#include "src/base/platform/platform.h"
 #include "src/base/win32-headers.h"
-#include "src/platform.h"
 #include "test/cctest/cctest.h"
 
 using namespace ::v8::internal;
@@ -54,5 +54,5 @@ TEST(VirtualMemory) {
 
 TEST(GetCurrentProcessId) {
   CHECK_EQ(static_cast<int>(::GetCurrentProcessId()),
-           OS::GetCurrentProcessId());
+           v8::base::OS::GetCurrentProcessId());
 }