Delete method StreamInterface::GetSize

Followup to https://webrtc-review.googlesource.com/c/4821

Bug: webrtc:6424, webrtc:7811
Change-Id: I6a4d8b52937256832509ebd33123c7b004263d8f
Reviewed-on: https://webrtc-review.googlesource.com/c/101181
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26199}
diff --git a/rtc_base/filerotatingstream_unittest.cc b/rtc_base/filerotatingstream_unittest.cc
index dc23e34..63ddc96 100644
--- a/rtc_base/filerotatingstream_unittest.cc
+++ b/rtc_base/filerotatingstream_unittest.cc
@@ -91,18 +91,15 @@
   void VerifyFileContents(const char* expected_contents,
                           const size_t expected_length,
                           const std::string& file_path) {
-    std::unique_ptr<uint8_t[]> buffer(new uint8_t[expected_length]);
+    std::unique_ptr<uint8_t[]> buffer(new uint8_t[expected_length + 1]);
     FileStream stream;
     ASSERT_TRUE(stream.Open(file_path, "r", nullptr));
     size_t size_read = 0;
-    EXPECT_EQ(rtc::SR_SUCCESS, stream.ReadAll(buffer.get(), expected_length,
-                                              &size_read, nullptr));
+    EXPECT_EQ(rtc::SR_EOS, stream.ReadAll(buffer.get(), expected_length + 1,
+                                          &size_read, nullptr));
     EXPECT_EQ(size_read, expected_length);
     EXPECT_EQ(0, memcmp(expected_contents, buffer.get(),
                         std::min(expected_length, size_read)));
-    size_t file_size = 0;
-    EXPECT_TRUE(stream.GetSize(&file_size));
-    EXPECT_EQ(file_size, expected_length);
   }
 
   std::unique_ptr<FileRotatingStream> stream_;
@@ -134,9 +131,10 @@
   std::string logfile_path = stream_->GetFilePath(0);
   FileStream stream;
   ASSERT_TRUE(stream.Open(logfile_path, "r", nullptr));
-  size_t file_size = 0;
-  EXPECT_TRUE(stream.GetSize(&file_size));
-  EXPECT_EQ(0u, file_size);
+  char buf[1];
+  size_t read_nbytes;
+  int read_error;
+  EXPECT_EQ(SR_EOS, stream.Read(buf, sizeof(buf), &read_nbytes, &read_error));
 }
 
 // Tests that a write operation followed by a read returns the expected data