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Now if Map() failed, we clear |data_| and |size_|, but |pp_resource_| is
not cleared. Therefore, if the caller calls buffer.is_null() it will
return false. Since the Init() failed, buffer.is_null() should return
true.

In this CL, if Map() failed, we call Clear() to explicitly clear
|pp_resource_|.

BUG=679801

Review-Url: https://codereview.chromium.org/2629543002
Cr-Commit-Position: refs/heads/master@{#443159}