blue to grey browser's progress bar

Change-Id: I7cabb70f84cd4f6c65a1c8b197831dad822498fa
Fix the problem that the favicons on the history page are shown ramdomly when the page is scrolled.

Steps to reproduce:
1. Visit some URLs to fill the history page.
2. Go to the history page.
3. Scroll up and down repeatedly.

What happened:
The favicons on the left side of the history page are shown ramdomly.

Change-Id: I243ec67899b13c5482e1503f7eab23dd9a5aa1f5
Signed-off-by: Sungmann Cho <sungmann.cho@navercorp.com>
fix browser blue textfield

Change-Id: I6f7fb8b0ff61d4d9d78a8580450f7d299c41d449
Handle DownloadManager expceptions

Handles illegal state exceptions thrown by DownloadManager
on two ocassions:
* the directory sdcard/Downloads is an ordinary file
* could not create dirctory sdcard/Downloads

Change will log an error, additionally toast with information
will pop up.

Change-Id: If853d3218a188bc77c187362a70697126b90989d