We are refactoring the StreamBufferManager to add reprocess mechanism into it and do regular capture via reprocess. Therefore, since we haven't mock reprocess mechanism, the TakePhotoTest will not work at this time.

Besides TakePhotoTest, we will need some more tests for testing reprocess mechanism, such as TakePortraitModePhotoTest.

Note that the refactoring also split StreamBufferManager into three parts and rename StreamBufferManagerTest to RequestManagerTest. As a result, the new tests should be added in RequestManagerTest rather than StreamBufferManagerTest after refactoring.