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Now, there are two callses that use WebFrameLoadType::Reload to call
WebFrame::reloadWithOverrideURL(). These callers can be modified to use
WebFrameLoadType::ReloadMainResoure insteads.

Also, this change removes default argument from WebFrame::reload() and
WebFrame::reloadWithOverrideURL() so to encourage using a right reload
type for each caller respectively. Also this will be better in terms of
coding style since default argument for virtual method is not recommended
in chromium.

BUG=670196

Review-Url: https://codereview.chromium.org/2567983008
Cr-Commit-Position: refs/heads/master@{#438737}