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This CL renames the send_command_and_get_result endpoint to
/goog/cdp/execute which follows the extension specification format
and is a more appropriate API name. Note we still support the old name.

Bug: chromedriver:2307
Change-Id: Ia7a389781eb92a2cf9bd6244e766e6c32e9b5ab9
Reviewed-on: https://chromium-review.googlesource.com/1091216Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Jonathon Kereliuk <kereliuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565356}