Drop Arial Unicode MS font and request only sans-serif

Arial Unicode MS does not have a bold version. Selecting this font
prevents correct display of bold text on Mac OS X. Simplify the
selector to sans-serif and allow the browser to use the user's
preferred font in this family.

Bug: issue 1863
Change-Id: I70627d974f6f34cc3b49821a4beb4c49032f6c6e

gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css

diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css b/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
index 192698e..93db54c 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css
@@ -20,7 +20,7 @@
 
 @def black #000000;
 @def white #ffffff;
-@def norm-font  Arial Unicode MS, Arial, sans-serif;
+@def norm-font  sans-serif;
 @def mono-font  monospace;
 
 @eval backgroundColor com.google.gerrit.client.Gerrit.getTheme().backgroundColor;
@@ -1164,7 +1164,7 @@
   margin-right: 5em;
   font-weight: bold;
   font-size: medium;
-  font-family: Arial Unicode;
+  font-family: norm-font;
 }
 
 /** Patch History Table **/

gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/src/main/java/public/hello.css

diff --git a/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/src/main/java/public/hello.css b/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/src/main/java/public/hello.css
index a88059d..73bf5c6 100644
--- a/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/src/main/java/public/hello.css
+++ b/gerrit-plugin-gwt-archetype/src/main/resources/archetype-resources/src/main/java/public/hello.css
@@ -6,7 +6,7 @@
  */
 
 body, table td, select {
-  font-family: Arial Unicode MS, Arial, sans-serif;
+  font-family: sans-serif;
   font-size: small;
 }
 pre {