refactor: remove unused restart private method (#2038)

Co-authored-by: Sameena Shaffeeullah <[email protected]>

Author: d-goog

src/resumable-upload.ts

@@ -899,25 +899,6 @@ export class Upload extends Writable {
     return successfulRequest ? res : null;
   }
 
-  private restart() {
-    if (this.numBytesWritten) {
-      const message =
-        'Attempting to restart an upload after unrecoverable bytes have been written from upstream. Stopping as this could result in data loss. Initiate a new upload to continue.';
-
-      this.emit('error', new RangeError(message));
-      return;
-    }
-
-    this.lastChunkSent = Buffer.alloc(0);
-    this.createURI(err => {
-      if (err) {
-        return this.destroy(err);
-      }
-      this.startUploading();
-      return;
-    });
-  }
-
   /**
    * @return {bool} is the request good?
    */

test/resumable-upload.ts

@@ -1679,61 +1679,6 @@ describe('resumable-upload', () => {
     });
   });
 
-  describe('#restart', () => {
-    beforeEach(() => {
-      up.createURI = () => {};
-    });
-
-    it('should throw if `numBytesWritten` is not 0', done => {
-      up.numBytesWritten = 8;
-
-      up.on('error', (error: Error) => {
-        assert(error instanceof RangeError);
-        assert(
-          /Attempting to restart an upload after unrecoverable bytes have been written/.test(
-            error.message
-          )
-        );
-        done();
-      });
-
-      up.restart();
-    });
-
-    describe('starting a new upload', () => {
-      it('should create a new URI', done => {
-        up.createURI = () => {
-          done();
-        };
-
-        up.restart();
-      });
-
-      it('should destroy stream if it cannot create a URI', done => {
-        const error = new Error(':(');
-
-        up.createURI = (callback: Function) => {
-          callback(error);
-        };
-
-        up.destroy = (err: Error) => {
-          assert.strictEqual(err, error);
-          done();
-        };
-
-        up.restart();
-      });
-
-      it('should start uploading', done => {
-        up.createURI = (callback: Function) => {
-          up.startUploading = done;
-          callback();
-        };
-        up.restart();
-      });
-    });
-  });
-
   describe('#onResponse', () => {
     beforeEach(() => {
       up.numRetries = 0;