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To use FrameMsg_Navigate_Type::RELOAD_MAIN_RESOURCE consistently
instead of FrameMsg_Navigate_Type::RELOAD in content, rename
RELOAD_MAIN_RESOURCE to RELOAD and override old behavior.

This change introduces two functional changes:

 1. RELOAD_ORIGINAL_REQUEST_URL is changed to revalidate
    only main resource instead of revalidating all.
    (in render_frame_impl.cc ReloadFrameLoadTypeFor)

 2. In LoadDataURL(), replace flag is set for usual reload
    operations. This was the original behavior, but unexpectedly
    changed in newly introduced ReloadMainResource cases.

BUG=670232
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2583123002
Cr-Commit-Position: refs/heads/master@{#443518}