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Reviewed by Dan Bernstein.

In theory, if malloc allocated a UChar buffer directly after a StringImpl,
the StringImpl might incorrecly assume that the UChar buffer was inline,
and fail to delete it.
        
This ASSERT is somewhat academic, since we don't use the same allocator
in debug builds, but oh well.

* platform/text/StringImpl.cpp:
(WebCore::StringImpl::StringImpl):
(WebCore::StringImpl::createUninitialized):
* platform/text/StringImpl.h: Separated the inline buffer StringImpl
constructor from the out-of-line buffer StringImpl constructor. Made
the former ASSERT that its buffer was indeed inline, and the latter ASSERT
that its buffer was indeed not inline.



git-svn-id: svn://svn.chromium.org/blink/trunk@54460 bbb929c8-8fbe-4397-9dbb-9b2b20218538