Fix goog.dom.dataset.remove in strict mode to handle Safari properly.

See http://stackoverflow.com/questions/28973603 for more context.

DELTA=3 (2 added, 0 deleted, 1 changed)
DELTA_BY_EXTENSION=js=3
RELNOTES: Fix goog.dom.dataset.remove for Safari in strict mode.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=122321211

Remove the definition of goog.array.ArrayLike in favor of IArrayLike

RELNOTES[INC]: the obsolete typedef goog.array.ArrayLike has been removed, use IArrayLike
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117277841

Allows AbstractDialogPlugin to be sealed, making subclasses compatibl…

…e with goog.defineClass.

RELNOTES: n/a
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113878307

Format Closure library with clang-format

RELNOTES: n/a
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=112731031

Treat string in goog.ui.Bubble as plain text.

RELNOTES[INC]: Breaking change for third parties: This will introduce double-escaping if your code passes a string with HTML code to goog.ui.Bubble. Pass SafeHtml instead.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=112188347

Automated g4 rollback of changelist 111522388.

*** Reason for rollback ***

Bringing original changes back

*** Original change description ***

Automated g4 rollback of changelist 111352260.

*** Reason for rollback ***

Breaks Gmail

*** Original change description ***

Allow further propagation of `mousedown` event for draggable elements.

There is currently an issue when default mousedown event gets cancelled for
draggable elements.
Consider an example when you have a draggable div with some
input inside. If you click on input, it won't get focus and you won't be able
to type anything, because focus is a default ev...

***
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=111525196