Bug 1068349 - IPC message handlers that return false cause child process to crash without a crash report. r=ted

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extra : rebase_source : b1cf6381b9a4f74cab75be8a2a903d26d83797dd
Bug 1068349 - Follow-up: Disable KillHard timer for content processes for Mochitests. r=smaug.

The KillHard timeout seems to be getting triggered on some of our mochitest machines, which is
causing us to leave minidumps behind - so we disable the timeout for mochitests. We also disable
KillHard paired minidumps for B2G, because we were getting minidumps for some B2G Desktop tests
there for what are likely some intentional KillHard's, and at this point, we don't think it's
worth collecting for B2G.

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extra : rebase_source : adcad58bc3b893e30e71992514b8a966257f8bc0
extra : amend_source : 11fd95ac3e3a5ed1dbb55d450f480b9092d31528