Revert of DevTools: Support async call stacks for FileSystem API (part 1). (https://codereview.chromium.org/383123009/)

Reason for revert:
This seems to add a lot of complexity into async code + violates the modularity: core/inspector should not be aware of the filesystems.

Original issue's description:
> DevTools: Support async call stacks for FileSystem API (part 1).
> 
> This patch does not yet tracks async stacks for FileWriter and FileReader.
> 
> BUG=272416, 390863
> R=kinuko@chromium.org, nhiroki@chromium.org, yurys
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178149

TBR=kinuko@chromium.org,nhiroki@chromium.org,yurys@chromium.org,aandrey@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=272416, 390863

Review URL: https://codereview.chromium.org/397843009

git-svn-id: svn://svn.chromium.org/blink/trunk@178269 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix image-rendering: pixelated on HiDPI screens.

An image with layout size equal to the image size should use InterpolationNone
because, on HiDPI screens, it will actually be upscaled.

BUG=391351

Review URL: https://codereview.chromium.org/385053002

git-svn-id: svn://svn.chromium.org/blink/trunk@178270 bbb929c8-8fbe-4397-9dbb-9b2b20218538