started: https://codereview.chromium.org/2660853002

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0dee95e08944e4ca548b5bf874d34a3695fc7a93

commit 0dee95e08944e4ca548b5bf874d34a3695fc7a93
Author: lushnikov <lushnikov@chromium.org>
Date: Tue Jan 31 05:47:13 2017

DevTools: fix search across all files in case of "file:" prefix

Search across files supports narrowing of the search scope with the
"file:" pattern. For example:

   [1]    file:front_end QUERY
   [2]    QUERY file:front_end

The bug happens only in the [1] case, when the query is prefixed with
"file:" pattern. In this case, we currently consider the query
to be " foobar" instead of "foobar" (e.g. containing excessive space in
front).

This patch swallows all the whitespaces around the "file:" pattern so
that they are not included in the actual search queries.

BUG= 686359 
R=dgozman

Review-Url: https://codereview.chromium.org/2660853002
Cr-Commit-Position: refs/heads/master@{#447196}

[modify] https://crrev.com/0dee95e08944e4ca548b5bf874d34a3695fc7a93/third_party/WebKit/LayoutTests/inspector/sources/search-config-expected.txt
[modify] https://crrev.com/0dee95e08944e4ca548b5bf874d34a3695fc7a93/third_party/WebKit/LayoutTests/inspector/sources/search-config.html
[modify] https://crrev.com/0dee95e08944e4ca548b5bf874d34a3695fc7a93/third_party/WebKit/Source/devtools/front_end/workspace/SearchConfig.js