Enable to open multiple file-pickers in Chromium for Linux

Sometimes, we don't know exact requirements or expect user behaviors while developing or fix something. I fixed the file-picker modal issue in Chromium for Linux last year. At that time, the reviewer and I thought that there would be no case to pop-up multiple file-pickers, but it happened  since M55 when you follow the following steps:
1) Enable "Ask where to save" in settings.
2) Open 2 tabs of e.g.: https://sourceforge.net/projects/azureus/files/latest/download
3) Wait for 2 downloader windows, and close/cancel/etc both
4) Freeze or crash

Here is a video to reproduce the problem.



When file-picker is opened, it disables event listening of the main host window. Then, the user closes the file-picker, it enables the event listening. Now, the host widow has a counter to check the number of the open file-pickers and it doesn't disable the event listening if there are any open file-picker. The event listening can be enabled when the last file-picker is closed. Here is the fix.
Anyway, you may see the fix in M58(Apr 25th, 2017)

Apple-style-span class was fully removed from Blink

Finally, Apple-style-span class was fully removed from Blink(commit).

Apple-style-span has not been produced since 2011: https://webkit.org/blog/1737/apple-style-span-is-gone, but there were still some legacy code to handle Apple-style-span class because old WebKit engines has produced it, but now the usage is quite low(<=0.0001%). So, we decided to remove it from Blink at BlinkOn7. The code was executed whenever the users copy a text or run Editing APIs(document.execCommand) to keep the styles when pasting it. Other non-standard CSS classes(Apple-interchange-newline, Apple-converted-space, Apple-paste-as-quotation) will be also removed soon if possible.

Anyway, I feel that editing in Chromium is a bit faster :P

My major contributions to Chromium project

I have been working on Chromium project since 2013 and fixed many bugs and implemented some features. Here are my major contributions:

Blink Editing

1. [Issue 226941] Contenteditable issues related to backspace handling
• https://codereview.chromium.org/2064473002
• https://codereview.chromium.org/2117663002
2. [Issue 318925] Copy and paste sometimes removes spaces between words

• https://codereview.chromium.org/2193033004
• https://codereview.chromium.org/2280513004
• https://codereview.chromium.org/2320533002
• https://codereview.chromium.org/2325553002
• https://codereview.chromium.org/2336043006

3. [Issue 310149] ContentEditable:   is forced on SPACE between text nodes
• https://codereview.chromium.org/2175163004
4. [Issue 335955] Unwanted spans inserted in contentEditable elements
• https://codereview.chromium.org/2072093002
5. [issue 571420] chrome hangs on when creating bullet list in contenteditable
• https://codereview.chromium.org/2250133004

6. [Issue 634482] Formatting tags converted to spans with styles on cut/paste
• https://codereview.chromium.org/2229703004
7. [Issue 625802] Unnecessary quote appears after clicking on indent more option in compose box.
• https://codereview.chromium.org/2175433002
8. [Issue 582225] document.queryCommandState isn't working well with _and
• https://codereview.chromium.org/1986563002
9. [Issue 584939] document.queryCommandState returns true for bold, italic, underline, and strikethrough after selecting image
• https://codereview.chromium.org/1960553002
10. [Issue 385374] queryCommandState can return true for both list types
• https://codereview.chromium.org/2268843002
11. [issue 232188] Caret color issue in content editable element
• https://codereview.chromium.org/14098003/ 

Aura and Wayland support:

1. [Issue 408481] System dialogs (e.g. 'Save As...') are not modal on Ubuntu
• https://codereview.chromium.org/1624793002/
2. [Issue 473228] Make *::ShowWithWindowState(minimized, maximized, fullscreen) consistent across platforms
• https://codereview.chromium.org/1125383008
• https://codereview.chromium.org/1138383008
• https://codereview.chromium.org/1159703006
• https://codereview.chromium.org/1130033003
3. Issue 578890 upstream wayland backend for ozone
• https://codereview.chromium.org/2042503002
4. Issue 50485 Korean Hangul typing issue  
• https://codereview.chromium.org/13818036/