DevTools: Rename inspector.js -> Main.js to follow the type name

R=aandrey, pfeldman, vsevik
NOTRY=true

Review URL: https://codereview.chromium.org/202763006

git-svn-id: svn://svn.chromium.org/blink/trunk@169542 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Minor Refactor in RenderListBox

This is a minor refactor, that removes an unused private member function valueChanged.

Review URL: https://codereview.chromium.org/204333002

git-svn-id: svn://svn.chromium.org/blink/trunk@169543 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move Image related tests from web/tests/ to platform/

Move BitmapImageTest.cpp, GIFImageDecoderTest.cpp and JPEGImageDecoderTest.cpp.

BUG=353585

Review URL: https://codereview.chromium.org/203543002

git-svn-id: svn://svn.chromium.org/blink/trunk@169544 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Making LayoutUnit conversions to Float type explicit
LayoutUnit misuse, often from improper conversion to other types,is a 
constant source of bugs in Blink. This is the second patch with the goal 
of making such error-prone conversions explicit in the hopes of forcing 
developers to think through these conversions while writing their patches.
These conversion sites were discovered by toggling the float conversions
to explicit and finding the compiler errors.

BUG=350474

Review URL: https://codereview.chromium.org/200023002

git-svn-id: svn://svn.chromium.org/blink/trunk@169545 bbb929c8-8fbe-4397-9dbb-9b2b20218538