Add #17913 to Wall of Browser Bugs

Refs https://code.google.com/p/chromium/issues/detail?id=544290
Refs https://bugs.webkit.org/show_bug.cgi?id=150271
Closes #17913
[ci skip]

docs/_data/browser-bugs.yml

@@ -148,6 +148,16 @@
   origin: >
     Bootstrap#17438, Bootstrap#14237
 
+-
+  browser: >
+    Chrome
+  summary: >
+    `float: right` doesn't consistently work correctly across page loads; possible race condition
+  upstream_bug: >
+    Chromium#544290
+  origin: >
+    Bootstrap#17913
+
 -
   browser: >
     Chrome (Windows & Linux)
@@ -188,6 +198,16 @@
   origin: >
     Bootstrap#17438, Bootstrap#14237
 
+-
+  browser: >
+    Safari
+  summary: >
+    `float: right` doesn't consistently work correctly across page loads; possible race condition
+  upstream_bug: >
+    WebKit#150271
+  origin: >
+    Bootstrap#17913
+
 -
   browser: >
     Safari (OS X)