Extra goog.require calls

[tschaub]

Resisting the urge to write a check-deps.js task ...

[tschaub]

Ok, now I've decided that it is not worth writing a strict check-deps.js task. We only need goog.require calls where 1) code in one module is used in another and 2) the compiler needs @typedef information to check assignment statements.

The two commits above remove goog.require calls that are not strictly required. In these cases, the ol.Image and ol.Tile functions are not accessed in the goog.requireing modules. So it is safe to remove these calls.

We cannot, however, remove goog.require calls for @typedef only provides like ol.Pixel or ol.Coordinate (unless we want to add type casts where ever we assign these types).

[fredj]

Please merge