Revert "Upconvert various types to int."

This reverts commit 83ad33a8aed1fb00e422b6abd33c3e8942821c24.

BUG=499241
TBR=hlundin

Review URL: https://codereview.webrtc.org/1179953003

Cr-Commit-Position: refs/heads/master@{#9418}
diff --git a/webrtc/modules/audio_coding/neteq/merge.cc b/webrtc/modules/audio_coding/neteq/merge.cc
index 23382ac..44fc511 100644
--- a/webrtc/modules/audio_coding/neteq/merge.cc
+++ b/webrtc/modules/audio_coding/neteq/merge.cc
@@ -311,7 +311,7 @@
   const int max_corr_length = kMaxCorrelationLength;
   int stop_position_downsamp = std::min(
       max_corr_length, expand_->max_lag() / (fs_mult_ * 2) + 1);
-  int correlation_shift = 0;
+  int16_t correlation_shift = 0;
   if (expanded_max * input_max > 26843546) {
     correlation_shift = 3;
   }
@@ -330,7 +330,7 @@
   int16_t* correlation_ptr = &correlation16[pad_length];
   int32_t max_correlation = WebRtcSpl_MaxAbsValueW32(correlation,
                                                      stop_position_downsamp);
-  int norm_shift = std::max(0, 17 - WebRtcSpl_NormW32(max_correlation));
+  int16_t norm_shift = std::max(0, 17 - WebRtcSpl_NormW32(max_correlation));
   WebRtcSpl_VectorBitShiftW32ToW16(correlation_ptr, stop_position_downsamp,
                                    correlation, norm_shift);