Fix chromium style checker error on windows sandbox code.

sandbox/win/src/Wow64.cc

Index: sandbox/win/src/Wow64.cc
diff --git a/sandbox/win/src/Wow64.cc b/sandbox/win/src/Wow64.cc
index f17838659191b2b1314cab3f9bf2da6eb48a33f7..24facfc7c11b37fed50016b03021fa6dd76e3df2 100644
--- a/sandbox/win/src/Wow64.cc
+++ b/sandbox/win/src/Wow64.cc
@@ -73,6 +73,10 @@ typedef BOOL (WINAPI* IsWow64ProcessFunction)(HANDLE process, BOOL* wow64);
 
 namespace sandbox {
 
+Wow64::Wow64(TargetProcess* child, HMODULE ntdll)
+    : child_(child), ntdll_(ntdll), dll_load_(NULL), continue_load_(NULL) {
+}
+
 Wow64::~Wow64() {
 }