Fix more disabled MSVC warnings, Source/wtf/dtoa* edition.

Mostly, this is about fixing "possible value truncation", usually when assigning
a larger type to a smaller one.

It was not always clear to me that certain (currently implied) casts were safe; please review those with particular care and let me know whether to remove the comment, add an assertion, or add handler code as relevant.

BUG=81439
TEST=none

Review URL: https://codereview.chromium.org/519613002

git-svn-id: svn://svn.chromium.org/blink/trunk@183092 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Gardening: Mac 10.6 expectations following r182920

There appear to be release vs. debug differences preventing a simple
rebaseline (or I'm just confused). Many of the 10.6 Debug results look
correct now, but I defer to the experts.

BUG=418091
TBR=eae@chromium.org,eustas@chromium.org,wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/615223008

git-svn-id: svn://svn.chromium.org/blink/trunk@183093 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Gardening: Widen flaky crash expectation for datepicker-crash-after-keydown.html

TBR=eustas@chromium.org

Review URL: https://codereview.chromium.org/623593003

git-svn-id: svn://svn.chromium.org/blink/trunk@183094 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r183073

http://src.chromium.org/viewvc/blink?view=revision&revision=183073

BUG=405166
TBR=wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/621773004

git-svn-id: svn://svn.chromium.org/blink/trunk@183095 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Change WebViewImpl::compositionRange to avoid crashing on RemoteFrame

BUG=399775

Review URL: https://codereview.chromium.org/621743005

git-svn-id: svn://svn.chromium.org/blink/trunk@183096 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Gardening: Mac 10.6 expectations

Rebasing these off the bot wasn't working. Needs manual love?

TBR=eustas@chromium.org
BUG=334269

Review URL: https://codereview.chromium.org/618403002

git-svn-id: svn://svn.chromium.org/blink/trunk@183097 bbb929c8-8fbe-4397-9dbb-9b2b20218538