DevTools: fix elements panel node picker code

The code for elements tree outline node selection was executed twice
for every mouse click in case of "node picker" functionality.

To fix this, the patch consumes the mouse click event as the node
was picked.

R=apavlov

Review URL: https://codereview.chromium.org/623723002

git-svn-id: svn://svn.chromium.org/blink/trunk@183152 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDB Bindings: Handle failed wrapper creation

If cursor wrapper creation fails, don't try and link the cursor and
request wrappers.

BUG=418769
R=haraken@chromium.org

Review URL: https://codereview.chromium.org/615983003

git-svn-id: svn://svn.chromium.org/blink/trunk@183153 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix more disabled MSVC warnings, Source/wtf/text/ edition.

Mostly, this is about fixing "possible value truncation", usually when assigning
a larger type to a smaller one.

It was not always clear to me that certain (currently implied) casts were safe; please review those with particular care and let me know whether to remove the comment, add an assertion, or add handler code as relevant.

BUG=81439
TEST=none

Review URL: https://codereview.chromium.org/520503002

git-svn-id: svn://svn.chromium.org/blink/trunk@183154 bbb929c8-8fbe-4397-9dbb-9b2b20218538