DevTools: [CodeMirror] handle new-lines in error popovers

Source/devtools/front_end/cmdevtools.css

 .CodeMirror {
   line-height: 1.2em !important;
   background-color: transparent !important;
 }
 
 .CodeMirror-linewidget {
   overflow: visible !important;
 }
 
 .CodeMirror .source-frame-eval-expression {
@@ skipping 225 matching lines @@
 }
 
 .text-editor-row-message:first-child {
   border-top-width: 0px;
 }
 
 .text-editor-row-message {
   border-top: 1px solid rgb(215, 215, 215);
   line-height: 1.2;
   white-space: nowrap;
+  display: flex;
 }
 
 .text-editor-row-message .bubble-repeat-count {
   margin-right: 1ex;
   margin-top: -1px;
 }
 
 .text-editor-row-message-icon {
   margin-right: 1ex;
+  margin-top: 2px;
 }
 
 .CodeMirror .text-editor-line-decoration-icon {
     position: absolute;
     cursor: pointer;
     right: -16px;
     top: -9px;
 }
 
 .CodeMirror .text-editor-line-with-warning:not(.cm-execution-line) {
@@ skipping 12 matching lines @@
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 .CodeMirror .text-editor-line-decoration-wave {
     background-image: url(Images/errorWave_2x.png);
 }
 } /* media */
 
 /** @see crbug.com/358161 */
 .CodeMirror .CodeMirror-vscrollbar, .CodeMirror .CodeMirror-hscrollbar {
   -webkit-transform: translateZ(0);
 }