Reviewed by Dan Bernstein.

Exclude floating objects from shrinking to avoid floats.  They should never do this.  Timing-related bugs could
occur as a result of this mistake, and the change to rewrite pagination to defer layout of floats until they
got encountered on the correct line exposed this issue.

Source/WebCore: 

Added /fast/block/float/float-overflow-hidden-containing-block-width.html.

* rendering/RenderBox.cpp:
(WebCore::RenderBox::shrinkToAvoidFloats):

LayoutTests: 

Added /fast/block/float/float-overflow-hidden-containing-block-width.html.
* fast/block/float/float-overflow-hidden-containing-block-width.html: Added.
* platform/mac/fast/block/float/float-overflow-hidden-containing-block-width-expected.checksum: Added.
* platform/mac/fast/block/float/float-overflow-hidden-containing-block-width-expected.png: Added.
* platform/mac/fast/block/float/float-overflow-hidden-containing-block-width-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@76074 268f45cc-cd09-0410-ab3c-d52691b4dbfc