[devtools] Improve code coverage color selection.

The color selection for code coverage (red+green) is not ideal for
developers that are impacted by color blindness. This changes the
colors to a brighter red and some blueish green that, a combination
that is known to work well enough for people impacted by different
kinds of color blindness.

https://pbs.twimg.com/media/EEU9fCzUUAItz4n?format=jpg shows an
example of how these two colors look like now.

Bug: chromium:1003671
Change-Id: I9c3e08fb350a6086624d63f44e069813c618588e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1801762
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696727}

third_party/blink/renderer/devtools/front_end/coverage/coverageListView.css

@@ -43,11 +43,11 @@
 }
 
 .data-grid td .bar-unused-size {
-  background-color: #E57373;
+  background-color: #EE442F;
 }
 
 .data-grid td .bar-used-size {
-  background-color: #81C784;
+  background-color: #63ACBE;
 }
 
 .data-grid td .percent-value {

third_party/blink/renderer/devtools/front_end/text_editor/cmdevtools.css

@@ -437,7 +437,7 @@ div.CodeMirror:focus-within span.CodeMirror-nonmatchingbracket {
 .CodeMirror .text-editor-coverage-unused-marker {
     text-align: right;
     padding-right: 2px;
-    background-color: #E57373;
+    background-color: #EE442F;
 }
 
 .CodeMirror .text-editor-coverage-unused-marker::after {
@@ -447,7 +447,7 @@ div.CodeMirror:focus-within span.CodeMirror-nonmatchingbracket {
 .CodeMirror .text-editor-coverage-used-marker {
     text-align: right;
     padding-right: 2px;
-    background-color: #81C784;
+    background-color: #63ACBE;
 }
 
 .CodeMirror .text-editor-coverage-used-marker::after {