Remove blink_asserts_always_on gyp variable.

dcheck_always_on=1 has the same effect now.

BUG=411008

Review URL: https://codereview.chromium.org/556683003

git-svn-id: svn://svn.chromium.org/blink/trunk@181687 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DirectWrite] Limit noSubpixelForSmallSizeFont to low-DPI

Limit the noSubpixelForSmallSizeFont functionality that disables
subpixel text for older fonts at sizes below 16px to low-DPI devices.
At or above a 150% DPI subpixel text is enabled for all fonts assuming
anti-aliasing is enabled.

As the font code isn't aware of the DPI or device pixel ratio it needs
to be supplied by Chrome though WebFontRendering.

Chrome side change is in https://codereview.chromium.org/561503002/

R=cpu@chromium.org, dglazkov@chromium.org
BUG=405445

Review URL: https://codereview.chromium.org/553163002

git-svn-id: svn://svn.chromium.org/blink/trunk@181688 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move isLoading() from WebFrame to WebLocalFrame

It is a concept that doesn't make sense for a remote frame (whether the load
event has fired), and all callsites are using WebLocalFrames

BUG=

Review URL: https://codereview.chromium.org/555953002

git-svn-id: svn://svn.chromium.org/blink/trunk@181689 bbb929c8-8fbe-4397-9dbb-9b2b20218538