Remove backwards-compat project update API

The project update endpoint accepted updates both in two array params:
docUpdates and fileUpdates, and in a single array: updates. This commit
removes the docUpdates/fileUpdates params now that web uses the updates
param.

services/document-updater/test/unit/js/HttpController/HttpControllerTests.js

@@ -809,92 +809,7 @@ describe('HttpController', function () {
     })
   })
 
-  describe('updateProject (split doc and file updates)', function () {
-    beforeEach(function () {
-      this.projectHistoryId = 'history-id-123'
-      this.userId = 'user-id-123'
-      this.docUpdates = [
-        { id: 1, pathname: 'thesis.tex', newPathname: 'book.tex' },
-        { id: 2, pathname: 'article.tex', docLines: 'hello' }
-      ]
-      this.fileUpdates = [
-        { id: 3, pathname: 'apple.png', newPathname: 'banana.png' },
-        { id: 4, url: 'filestore.example.com/4' }
-      ]
-      this.expectedUpdates = [
-        {
-          type: 'rename-doc',
-          id: 1,
-          pathname: 'thesis.tex',
-          newPathname: 'book.tex'
-        },
-        { type: 'add-doc', id: 2, pathname: 'article.tex', docLines: 'hello' },
-        {
-          type: 'rename-file',
-          id: 3,
-          pathname: 'apple.png',
-          newPathname: 'banana.png'
-        },
-        { type: 'add-file', id: 4, url: 'filestore.example.com/4' }
-      ]
-      this.version = 1234567
-      this.req = {
-        query: {},
-        body: {
-          projectHistoryId: this.projectHistoryId,
-          userId: this.userId,
-          docUpdates: this.docUpdates,
-          fileUpdates: this.fileUpdates,
-          version: this.version
-        },
-        params: {
-          project_id: this.project_id
-        }
-      }
-    })
-
-    describe('successfully', function () {
-      beforeEach(function () {
-        this.ProjectManager.updateProjectWithLocks = sinon.stub().yields()
-        this.HttpController.updateProject(this.req, this.res, this.next)
-      })
-
-      it('should accept the change', function () {
-        this.ProjectManager.updateProjectWithLocks
-          .calledWith(
-            this.project_id,
-            this.projectHistoryId,
-            this.userId,
-            this.expectedUpdates,
-            this.version
-          )
-          .should.equal(true)
-      })
-
-      it('should return a successful No Content response', function () {
-        this.res.sendStatus.calledWith(204).should.equal(true)
-      })
-
-      it('should time the request', function () {
-        this.Metrics.Timer.prototype.done.called.should.equal(true)
-      })
-    })
-
-    describe('when an errors occurs', function () {
-      beforeEach(function () {
-        this.ProjectManager.updateProjectWithLocks = sinon
-          .stub()
-          .yields(new Error('oops'))
-        this.HttpController.updateProject(this.req, this.res, this.next)
-      })
-
-      it('should call next with the error', function () {
-        this.next.calledWith(sinon.match.instanceOf(Error)).should.equal(true)
-      })
-    })
-  })
-
-  describe('updateProject (single updates parameter)', function () {
+  describe('updateProject', function () {
     beforeEach(function () {
       this.projectHistoryId = 'history-id-123'
       this.userId = 'user-id-123'