Removing, opening and creating files in platform_file and file

webrtc/base/file.cc

Index: webrtc/base/file.cc
diff --git a/webrtc/base/file.cc b/webrtc/base/file.cc
index 9a865884ea07ca6f956c36318193ecb4bfa9293d..c97504f9c737a438c1b2bd585e58bddb087810ed 100644
--- a/webrtc/base/file.cc
+++ b/webrtc/base/file.cc
@@ -18,6 +18,14 @@ File::~File() {
   Close();
 }
 
+File File::Open(const std::string& path) {
+  return File(OpenPlatformFile(path));
+}
+
+File File::Create(const std::string& path) {
+  return File(CreatePlatformFile(path));
+}
+
 File::File(File&& other) : file_(other.file_) {
   other.file_ = kInvalidPlatformFileValue;
 }