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Currently we attempt to query
RenderFrameDevToolsAgentHost::IsNetworkHandlerEnabled based on the frame
that is navigating. However, there may not be a
RenderFrameDevToolsAgentHost for a subframe that is navigating even
though there is one for the top-level frame, where the NetworkHandler is
active. This prevents from properly reporting headers in subframe
navigations.

BUG=551000
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2628593002
Cr-Commit-Position: refs/heads/master@{#442961}