TEST ONLY: URLRequestFileJob::OnReadComplete doens't fire for 0 byte file.

net/url_request/url_request_file_job_unittest.cc

Index: net/url_request/url_request_file_job_unittest.cc
diff --git a/net/url_request/url_request_file_job_unittest.cc b/net/url_request/url_request_file_job_unittest.cc
index 2e5aafffbc26a04e1287ab51dd5dfdb17ae85d46..a599da4bcaa2ec682d6e3d189b224cb7c9b874a8 100644
--- a/net/url_request/url_request_file_job_unittest.cc
+++ b/net/url_request/url_request_file_job_unittest.cc
@@ -54,12 +54,14 @@ class TestURLRequestFileJob : public URLRequestFileJob {
 
  protected:
   void OnOpenComplete(int result) override {
+    printf("T: OnOpenComplete: %d\n", result);
     // Should only be called once.
     ASSERT_EQ(ERR_IO_PENDING, *open_result_);
     *open_result_ = result;
   }
 
   void OnSeekComplete(int64_t result) override {
+    printf("T: OnSeekComplete: %ld\n", result);
     // Should only call this if open succeeded.
     EXPECT_EQ(OK, *open_result_);
     // Should only be called once.
@@ -68,6 +70,7 @@ class TestURLRequestFileJob : public URLRequestFileJob {
   }
 
   void OnReadComplete(IOBuffer* buf, int result) override {
+    printf("T: OnReadComplete: %d\n", result);
     // Should only call this if seek succeeded.
     EXPECT_GE(*seek_position_, 0);
     observed_content_->append(std::string(buf->data(), result));
@@ -150,7 +153,7 @@ class TestJobFactory : public URLRequestJobFactory {
 // Returns true on success.
 bool CreateFileWithContent(const std::string& content,
                            const base::FilePath& path) {
-  return base::WriteFile(path, content.c_str(), content.length());
+  return base::WriteFile(path, content.c_str(), content.length()) != -1;
 }
 
 // A simple holder for start/end used in http range requests.
@@ -308,6 +311,10 @@ TEST_F(URLRequestFileJobEventsTest, TinyFile) {
   RunSuccessfulRequestWithString(std::string("hello world"), NULL);
 }
 
+TEST_F(URLRequestFileJobEventsTest, ZeroFile) {
+  RunSuccessfulRequestWithString(std::string(""), NULL);
+}
+
 TEST_F(URLRequestFileJobEventsTest, SmallFile) {
   RunSuccessfulRequestWithString(MakeContentOfSize(17 * 1024), NULL);
 }