Update account and sync management UX

chrome/android/java/res/values-v17/styles.xml

Index: chrome/android/java/res/values-v17/styles.xml
diff --git a/chrome/android/java/res/values-v17/styles.xml b/chrome/android/java/res/values-v17/styles.xml
index f59cc447f2aac8d911f2d501240da8eaf6c9bc69..7db8edaa5e6a22ccdd0768494859b7d50327706f 100644
--- a/chrome/android/java/res/values-v17/styles.xml
+++ b/chrome/android/java/res/values-v17/styles.xml
@@ -73,6 +73,7 @@
 
     <!-- Preferences -->
     <style name="PreferencesTheme" parent="ThemeWithActionBar">
+        <item name="android:divider">@null</item>

[newt (away), 2016/02/12 22:03:49]

Does this remove the dividers all throughout preferences? If so, we should do
this as a separate change since other preference screens will need updating.

[May, 2016/02/16 17:32:06]

It was supposed to, but when I check on it now, the divider is still there. Not
sure why (I swear I had a build where there were no dividers...) but I'm
removing this bit for now.

[newt (away), 2016/02/16 23:05:01]

Strange. Once we switch to using the support library preferences
(crbug.com/585814), it may be easier to control the dividers in settings. I'd
like to update our dividers on all settings screens, since the dividers (on all
screens) have never matched the mocks.

         <item name="android:textColorLink">@color/pref_accent_color</item>
         <item name="android:textAppearanceMedium">@style/PreferenceTextAppearanceMedium</item>
         <item name="android:preferenceCategoryStyle">@style/PreferenceCategory</item>