Put back line breaking for view-source document

In crbug.com/920571, several changes were made for performance
reasons, and one of these changes was to stop breaking lines and
just allow each source line to take up one view-source-table line.
This did improve performance (significantly in some cases, e.g.
150X), but this is a behavior change that caused some developer
pain.

This CL puts back word breaking, temporarily, while a solution
to the developer pain point is found.

Bug: 920571
Change-Id: I2fc744c034b9ff90ca6e560fda5b077a8a8a1bcf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529969
Commit-Queue: Koji Ishii <kojii@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826028}

third_party/blink/renderer/core/css/view-source.css

@@ -27,9 +27,10 @@ body {
 }
 
 table {
-    width: max-content;
+    width: 100%;
     border-spacing: 0;
-    white-space: pre;
+    white-space: pre-wrap !important;
+    word-break: break-word;
     margin: 0;
     font-size: initial;
     font-family: monospace;