Revert "Remove implicit dependencies."

Revert "Remove implicit dependencies."

This reverts r43874.

Revert "Register literals through backend."

This reverts r43876.

FAILED: dart2js-d8-checked release_ia32 utils/source_mirrors_test
out/ReleaseIA32/dart-sdk/lib/_internal/compiler/js_lib/preambles/d8.js:263: Uncaught Error: Invalid argument(s): "_Proxy" is a private identifier
Stack Trace:
Error
    at dart.wrapException (/mnt/data/b/build/slave/dart2js-linux-release-checked-1-5-be/build/dart/out/ReleaseIA32/generated_compilations/dart2js-checked-sdk/tests_utils_source_mirrors_test/out.js:2990:15)
    at dart.Symbol0.static.Symbol_validatePublicSymbol (/mnt/data/b/build/slave/dart2js-linux-release-checked-1-5-be/build/dart/out/ReleaseIA32/generated_compilations/dart2js-checked-sdk/tests_utils_source_mirrors_test/out.js:11047:19)

That is, attempting to create a symbol for _Proxy, which is something I did change.

Also, many dart2dart fails with errors like this:

Internal Error: Function signature has not been computed for function(Symbol#).
  const factory Symbol(String name) = internal.Symbol;
                ^^^^^^

Also something that I changed.

Committed: https://code.google.com/p/dart/source/detail?r=43878

[ahe, 2015-02-19 15:30:45]

ahe@google.com changed reviewers:
+ johnniwinther@google.com

[ahe, 2015-02-19 15:30:58]

TBR

[ahe, 2015-02-19 15:31:53]

Committed patchset #1 (id:1) manually as 43878 (presubmit successful).

[Johnni Winther, 2015-02-19 15:34:42]

lgtm