Revert "refactor(platform-browser): move platform-browser/animations to animations/browser (#15043)"

This reverts commit 195b863ea4.

packages/animations/browser/src/dsl/animation_transition_factory.ts

@@ -1,46 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-import {AnimationMetadata, AnimationTransitionMetadata, sequence, ɵStyleData} from '@angular/animations';
-
-import {buildAnimationKeyframes} from './animation_timeline_visitor';
-import {TransitionMatcherFn} from './animation_transition_expr';
-import {AnimationTransitionInstruction, createTransitionInstruction} from './animation_transition_instruction';
-
-export class AnimationTransitionFactory {
-  private _animationAst: AnimationMetadata;
-
-  constructor(
-      private _triggerName: string, ast: AnimationTransitionMetadata,
-      private matchFns: TransitionMatcherFn[],
-      private _stateStyles: {[stateName: string]: ɵStyleData}) {
-    const normalizedAst = Array.isArray(ast.animation) ?
-        sequence(<AnimationMetadata[]>ast.animation) :
-        <AnimationMetadata>ast.animation;
-    this._animationAst = normalizedAst;
-  }
-
-  match(currentState: any, nextState: any): AnimationTransitionInstruction {
-    if (!oneOrMoreTransitionsMatch(this.matchFns, currentState, nextState)) return;
-
-    const backupStateStyles = this._stateStyles['*'] || {};
-    const currentStateStyles = this._stateStyles[currentState] || backupStateStyles;
-    const nextStateStyles = this._stateStyles[nextState] || backupStateStyles;
-
-    const timelines =
-        buildAnimationKeyframes(this._animationAst, currentStateStyles, nextStateStyles);
-
-    return createTransitionInstruction(
-        this._triggerName, currentState, nextState, nextState === 'void', currentStateStyles,
-        nextStateStyles, timelines);
-  }
-}
-
-function oneOrMoreTransitionsMatch(
-    matchFns: TransitionMatcherFn[], currentState: any, nextState: any): boolean {
-  return matchFns.some(fn => fn(currentState, nextState));
-}