Fix the case where the browser livelocks if we cannot open a file.

net/base/file_stream_win.cc

Index: net/base/file_stream_win.cc
diff --git a/net/base/file_stream_win.cc b/net/base/file_stream_win.cc
index cec6a9d65cfe27e594e68649474f90a402e800b4..e1928a73f4409b1d6f5bdc9d10eaffc5eb1d910b 100644
--- a/net/base/file_stream_win.cc
+++ b/net/base/file_stream_win.cc
@@ -120,16 +120,10 @@ FileStream::FileStream()
       open_flags_(0) {
 }
 
-FileStream::FileStream(base::PlatformFile file, int flags)
-    : file_(file),
-      open_flags_(flags) {
-  // If the file handle is opened with base::PLATFORM_FILE_ASYNC, we need to
-  // make sure we will perform asynchronous File IO to it.
-  if (flags & base::PLATFORM_FILE_ASYNC) {
-    async_context_.reset(new AsyncContext(this));
-    MessageLoopForIO::current()->RegisterIOHandler(file_,
-                                                   async_context_.get());
-  }
+FileStream::FileStream(base::PlatformFile file, int open_flags)
+    : file_(INVALID_HANDLE_VALUE),
+      open_flags_(0) {
+  Open(file, open_flags);
 }
 
 FileStream::~FileStream() {
@@ -147,6 +141,13 @@ void FileStream::Close() {
   }
 }
 
+void FileStream::Release() {
+  if (file_ != INVALID_HANDLE_VALUE)
+    CancelIo(file_);
+  async_context_.reset();
+  file_ = INVALID_HANDLE_VALUE;
+}
+
 int FileStream::Open(const FilePath& path, int open_flags) {
   if (IsOpen()) {
     DLOG(FATAL) << "File is already open!";
@@ -170,6 +171,26 @@ int FileStream::Open(const FilePath& path, int open_flags) {
   return OK;
 }
 
+int FileStream::Open(base::PlatformFile file, int open_flags) {
+  if (IsOpen()) {
+    DLOG(FATAL) << "File is already open!";
+    return ERR_UNEXPECTED;
+  }
+
+  open_flags_ = open_flags;
+  file_ = file;
+
+  // If the file handle is opened with base::PLATFORM_FILE_ASYNC, we need to
+  // make sure we will perform asynchronous File IO to it.
+  if (open_flags_ & base::PLATFORM_FILE_ASYNC) {
+    async_context_.reset(new AsyncContext(this));
+    MessageLoopForIO::current()->RegisterIOHandler(file_,
+                                                   async_context_.get());
+  }
+
+  return OK;
+}
+
 bool FileStream::IsOpen() const {
   return file_ != INVALID_HANDLE_VALUE;
 }