[DevTools] Copy objects from debugger context to inspected context properly.

BUG=637594

Review-Url: https://codereview.chromium.org/2253643002
Cr-Original-Commit-Position: refs/heads/master@{#412436}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 93bc623489bdcfc7e9127614fcfb3258edf3f0f9
7 files changed