Revert of Invert DSF to map from delegated frame to layer space

Revert of Invert DSF to map from delegated frame to layer space (https://codereview.chromium.org/311253004/)

Reason for revert:
https://code.google.com/p/chromium/issues/detail?id=381982

Original issue's description:
> Invert DSF to map from delegated frame to layer space
> 
> The size of the frame data from a delegated source will not in general match up
> exactly with the delegated layer's bounds. Frame sizes and layer bounds are both
> expressed as integers, but frame sizes are in physical pixels and layer bounds
> are in device-independent pixels. If the device scale is not an integer, there
> may not be an exact mapping between the two spaces. For instance, if the layer
> size is 105 x 211 and the device scale is 1.5, the delegated content is
> responsible for filling 157.5 x 316.5 physical pixels in the final output. This
> isn't really possible so what actually happens is the delegated renderer
> produces a frame with a physical size of 158 x 317 pixels and sends that up to
> the DRLI. To map this frame into physical space, the DRLI should apply the
> inverse of the device scale factor to reflect that the frame covers 105.333 x
> 211.3333 logical pixels.
> 
> Before this patch, DRLI would attempt to scale the frame by (105/158, 211/317)
> resulting in the frame being scaled down non-uniformly to try to make 158 x 317
> pixels fit into a 157.5 x 316.6 space. This scaling looks bad and ends up
> mapping pixels partially outside of the layer's logical bounds into the layer's
> logical bounds.
> 
> BUG=370074
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275544

TBR=enne@chromium.org,danakj@chromium.org,jamesr@chromium.org,jam@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=370074, 381982
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275600

[acleung1, 2014-06-07 03:20:42]

Created Revert of Invert DSF to map from delegated frame to layer space

[commit-bot: I haz the power, 2014-06-07 03:21:13]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/acleung@chromium.org/313403005/1

[commit-bot: I haz the power, 2014-06-07 03:21:13]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-07 03:21:14]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[dcheng, 2014-06-07 03:24:15]

LGTM

[dcheng, 2014-06-07 03:26:34]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-06-07 03:29:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/acleung@chromium.org/313403005/1

[commit-bot: I haz the power, 2014-06-07 03:32:02]

Change committed as 275600