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Change the implementation of the WebFramesManagerImpl to use
a map instead of a vector.
WebFrames are uniquely identified by frameID, so having a map
frameID -> WebFrame will ensure that there uniqueness and make
lookup easier and faster (log(N) instead of N).

Bug: 851636
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: If3c76acd8b1bd05a57821c87b571cffa7b8d3607
Reviewed-on: https://chromium-review.googlesource.com/1142781
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585469}