Revert "Signal handling."

runtime/bin/process.h

Index: runtime/bin/process.h
diff --git a/runtime/bin/process.h b/runtime/bin/process.h
index 4709770304e1c1b012b50c4a328760f966b6368f..02a9ecc845372bf46fa04c0ce5cb2f2c32e5d4a1 100644
--- a/runtime/bin/process.h
+++ b/runtime/bin/process.h
@@ -84,9 +84,6 @@ class Process {
 
   static intptr_t CurrentProcessId();
 
-  static intptr_t SetSignalHandler(intptr_t signal);
-  static void ClearSignalHandler(intptr_t signal);
-
   static Dart_Handle GetProcessIdNativeField(Dart_Handle process,
                                              intptr_t* pid);
   static Dart_Handle SetProcessIdNativeField(Dart_Handle process,
@@ -101,46 +98,6 @@ class Process {
 };
 
 
-class SignalInfo {
- public:
-  SignalInfo(int fd, int signal, SignalInfo* prev = NULL)
-      : fd_(fd),
-        signal_(signal),
-        // SignalInfo is expected to be created when in a isolate.
-        port_(Dart_GetMainPortId()),
-        next_(NULL),
-        prev_(prev) {
-    if (prev_ != NULL) {
-      prev_->next_ = this;
-    }
-  }
-
-  ~SignalInfo();
-
-  void Unlink() {
-    if (prev_ != NULL) {
-      prev_->next_ = next_;
-    }
-    if (next_ != NULL) {
-      next_->prev_ = prev_;
-    }
-  }
-
-  int fd() const { return fd_; }
-  int signal() const { return signal_; }
-  Dart_Port port() const { return port_; }
-  SignalInfo* next() const { return next_; }
-
- private:
-  int fd_;
-  int signal_;
-  // The port_ is used to identify what isolate the signal-info belongs to.
-  Dart_Port port_;
-  SignalInfo* next_;
-  SignalInfo* prev_;
-};
-
-
 // Utility class for collecting the output when running a process
 // synchronously by using Process::Wait. This class is sub-classed in
 // the platform specific files to implement reading into the buffers