remove use of {,un}setPendingActivity from DOMFileSystem.

{,un}setPendingActivity is deprecated. This CL replaces it with |hasPendingActivity()| override.

This also makes FileSystemCallbacks reference to the DOMFileSystem strong, as |addPendingCallbacks()| would no longer ref() DOMFileSystem.

TEST=fast/filesystem
BUG=354845

Review URL: https://codereview.chromium.org/212263002

git-svn-id: svn://svn.chromium.org/blink/trunk@170052 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert of Add runtime feature and property names for unprefixed CSS Transforms (https://codereview.chromium.org/211033002/)

Reason for revert:
Breaks telemetry_unittests: 
http://build.chromium.org/p/chromium.webkit/builders/Win7%20%28dbg%29/builds/13762

Here is how you can run the tests after you build debug chrome: 
tools/telemetry/run_tests --browser=debug web_components.web_components_unittest

Original issue's description:
> Add runtime feature and property names for unprefixed CSS Transforms
> 
> Adds a runtime flag (enabled only for testing) and defines property names
> for each property defined in CSS Transforms[1]. Future patches will make
> these properties functional.
> 
> [1] http://www.w3.org/TR/css3-transforms/
> 
> NOTRY=true
> BUG=154772
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170005

TBR=eseidel@chromium.org,esprehn@chromium.org,dstockwell@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=154772

Review URL: https://codereview.chromium.org/212563007

git-svn-id: svn://svn.chromium.org/blink/trunk@170053 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: InspectorHistory actions become refcounted.

This patch makes InspectorHistory::Action class to be refcounted. This
helps to get results of completed operations in InspectorHistory without
possibility of use-after-free (this patch fixes two of this cases).

BUG=

Review URL: https://codereview.chromium.org/208893007

git-svn-id: svn://svn.chromium.org/blink/trunk@170054 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Add timestamp support in the console

Add a setting which when enabled will append a time stamp to each
message in the console.

BUG=131714

Review URL: https://codereview.chromium.org/185713007

git-svn-id: svn://svn.chromium.org/blink/trunk@170055 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: fix pretty-print functionality for VM scripts

This patch fixes pretty-print functionality for VM scripts.

BUG=356269

Review URL: https://codereview.chromium.org/211243006

git-svn-id: svn://svn.chromium.org/blink/trunk@170056 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Show user code location for wrapped console.log() calls.

Instead of pointing to actual console.log() call done from a framework wrapper function,
we should point to the user code.

BUG=231007
R=pfeldman

Review URL: https://codereview.chromium.org/211493002

git-svn-id: svn://svn.chromium.org/blink/trunk@170057 bbb929c8-8fbe-4397-9dbb-9b2b20218538