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Fix: Initialize the resource_type field with a default value kMainFrame.

We'd like to know for each safe browsing blocking page created, what
is the resource type that triggers the page. This information
can help us decide the priority of resource types that should be
checked in real time.

Metrics added in this CL:
SafeBrowsing.BlockingPage.ResourceType

Bug: 1065137
Change-Id: I38f2b0b4787fb1c04ee515e08856d4ab8b00aa07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2133115Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756914}