Update audio code to use size_t more correctly, webrtc/common_audio/ portion.

webrtc/common_audio/blocker.h

Index: webrtc/common_audio/blocker.h
diff --git a/webrtc/common_audio/blocker.h b/webrtc/common_audio/blocker.h
index 00f372dfd0ed15f5ca4e6f79d6e4ddafe0e6c663..025638ae8c462acdd38f0be685b5bd74f940f898 100644
--- a/webrtc/common_audio/blocker.h
+++ b/webrtc/common_audio/blocker.h
@@ -25,7 +25,7 @@ class BlockerCallback {
   virtual ~BlockerCallback() {}
 
   virtual void ProcessBlock(const float* const* input,
-                            int num_frames,
+                            size_t num_frames,
                             int num_input_channels,
                             int num_output_channels,
                             float* const* output) = 0;
@@ -63,34 +63,34 @@ class BlockerCallback {
 // copy of window and does not attempt to delete it.
 class Blocker {
  public:
-  Blocker(int chunk_size,
-          int block_size,
+  Blocker(size_t chunk_size,
+          size_t block_size,
           int num_input_channels,
           int num_output_channels,
           const float* window,
-          int shift_amount,
+          size_t shift_amount,
           BlockerCallback* callback);
 
   void ProcessChunk(const float* const* input,
-                    int chunk_size,
+                    size_t chunk_size,
                     int num_input_channels,
                     int num_output_channels,
                     float* const* output);
 
  private:
-  const int chunk_size_;
-  const int block_size_;
+  const size_t chunk_size_;
+  const size_t block_size_;
   const int num_input_channels_;
   const int num_output_channels_;
 
   // The number of frames of delay to add at the beginning of the first chunk.
-  const int initial_delay_;
+  const size_t initial_delay_;
 
   // The frame index into the input buffer where the first block should be read
   // from. This is necessary because shift_amount_ is not necessarily a
   // multiple of chunk_size_, so blocks won't line up at the start of the
   // buffer.
-  int frame_offset_;
+  size_t frame_offset_;
 
   // Since blocks nearly always overlap, there are certain blocks that require
   // frames from the end of one chunk and the beginning of the next chunk. The
@@ -113,7 +113,7 @@ class Blocker {
 
   // The amount of frames between the start of contiguous blocks. For example,
   // |shift_amount_| = |block_size_| / 2 for a Hann window.
-  int shift_amount_;
+  size_t shift_amount_;
 
   BlockerCallback* callback_;
 };