Bug 1414786: Do not match caption's labels with child combinators. r=dao

Nested captions are not used, nor nested labels inside captions.

Another approach would be to just move all our captions that currently use
<caption><label> to use <caption label="">, and get rid of the <xbl:children>
element.

Let me know if that's preferred, but seems not necessary to me.

MozReview-Commit-ID: Gx7vB0tio5O

--HG--
extra : rebase_source : 752765f30aa5b0b26e57d2144bcdca2cce5d09cb

browser/themes/linux/preferences/in-content/dialog.css

@@ -8,7 +8,7 @@ label:not(.menu-text),
 textbox,
 description,
 .tab-text,
-caption > label {
+caption label {
   font-size: 1.11rem;
 }
 

browser/themes/linux/preferences/in-content/preferences.css

@@ -10,7 +10,7 @@ window * {
   font-size: 1.11rem;
 }
 
-caption > label:not(.dialogTitle) {
+caption label:not(.dialogTitle) {
   font-size: 1.27rem;
 }
 

browser/themes/osx/preferences/in-content/dialog.css

@@ -13,7 +13,7 @@ label:not(.menu-text),
 textbox,
 description,
 .tab-text,
-caption > label {
+caption label {
   font-size: 1.36rem;
 }
 

browser/themes/osx/preferences/in-content/preferences.css

@@ -10,7 +10,7 @@ window * {
   font-size: 1.36rem;
 }
 
-caption > label:not(.dialogTitle) {
+caption label:not(.dialogTitle) {
   font-size: 1.55rem;
 }
 

browser/themes/windows/preferences/in-content/dialog.css

@@ -8,7 +8,7 @@ label:not(.menu-text),
 textbox,
 description,
 .tab-text,
-caption > label {
+caption label {
   font-size: 1.25rem;
 }
 

browser/themes/windows/preferences/in-content/preferences.css

@@ -10,7 +10,7 @@ window * {
   font-size: 1.25rem;
 }
 
-caption > label:not(.dialogTitle) {
+caption label:not(.dialogTitle) {
   font-size: 1.42rem;
 }
 

toolkit/themes/shared/in-content/common.inc.css

@@ -77,14 +77,14 @@ xul|caption {
 }
 
 html|h2,
-xul|caption > xul|checkbox,
-xul|caption > xul|label {
+xul|caption xul|checkbox,
+xul|caption xul|label {
   font-weight: 600;
   line-height: 22px;
 }
 
-xul|caption > xul|checkbox,
-xul|caption > xul|label {
+xul|caption xul|checkbox,
+xul|caption xul|label {
   margin: 0 !important;
 }