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Original CL was reverted due to breaking webkit_tests in
chromium.webkit/builders/WebKit%20Mac10.9/builds/40056

This is due to a problem that already bit me :-)
build infra script to zip up mojom files wasn't updated,
ongoing in https://chromium-review.googlesource.com/c/414565/

Original CL description ------------------------------
ImageCapture: move image_capture.mojom to media/capture/mojo/

This CL moves image_capture.mojom from media/mojo/interfaces/ to
media/capture/mojo/ where it belongs logically speaking, and
updates BUILD.gns and include paths.

image_capture.mojom was in media/mojo/interfaces because
when it landed, media/capture/mojo was not existing.

BUG=518807
TEST=No code touched, if compile passes, it works
(but there's also content_browsertests).

TBR=xhwang@chromium.org for the removal in media/mojo/interfaces/BUILD.gn

Review-Url: https://codereview.chromium.org/2539543002
Cr-Commit-Position: refs/heads/master@{#434873}