SignalInfo must store fd_ as an intptr_t not an int.
SignalInfo must store fd_ as an intptr_t not an int.

On Windows we use this field to store a pointer to FileHandle object.

Type of SignalInfo::signal_ is changed to intptr_t too for consistency.

BUG=http://dartbug.com/25345
R=fschneider@google.com

Review URL: https://codereview.chromium.org/1601183003 .

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