Camera: cleanup some dead code

We no longer have code path running non-HIDL interface.
This cleanup also simplifies some logic needed for fixing
b/132594861

Bug: 132594861
Test: Camera CTS
Change-Id: If15ea359a1a59c5a8e7a59818ce4db8120000bc4
diff --git a/services/camera/libcameraservice/device3/Camera3Device.h b/services/camera/libcameraservice/device3/Camera3Device.h
index 8f74611..fe94f8e 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.h
+++ b/services/camera/libcameraservice/device3/Camera3Device.h
@@ -289,9 +289,6 @@
         // Reset this HalInterface object (does not call close())
         void clear();
 
-        // Check if HalInterface support sending requests in batch
-        bool supportBatchRequest();
-
         // Calls into the HAL interface
 
         // Caller takes ownership of requestTemplate
@@ -300,7 +297,11 @@
         status_t configureStreams(const camera_metadata_t *sessionParams,
                 /*inout*/ camera3_stream_configuration *config,
                 const std::vector<uint32_t>& bufferSizes);
-        status_t processCaptureRequest(camera3_capture_request_t *request);
+
+        // When the call succeeds, the ownership of acquire fences in requests is transferred to
+        // HalInterface. More specifically, the current implementation will send the fence to
+        // HAL process and close the FD in cameraserver process. When the call fails, the ownership
+        // of the acquire fence still belongs to the caller.
         status_t processBatchCaptureRequests(
                 std::vector<camera3_capture_request_t*>& requests,
                 /*out*/uint32_t* numRequestProcessed);
@@ -895,9 +896,6 @@
         // Clear repeating requests. Must be called with mRequestLock held.
         status_t clearRepeatingRequestsLocked(/*out*/ int64_t *lastFrameNumber = NULL);
 
-        // send request in mNextRequests to HAL one by one. Return true = sucssess
-        bool sendRequestsOneByOne();
-
         // send request in mNextRequests to HAL in a batch. Return true = sucssess
         bool sendRequestsBatch();