Bug 918176 - Silence uninitialized variable warning in nsRuleNode::ComputeContentData. r=dholbert

layout/base/nsCSSFrameConstructor.cpp

@@ -1639,6 +1639,10 @@ nsCSSFrameConstructor::CreateGeneratedContent(nsFrameConstructorState& aState,
 
       break;
     }
+
+  case eStyleContentType_Uninitialized:
+    NS_NOTREACHED("uninitialized content type");
+    return nullptr;
   } // switch
 
   return nullptr;

layout/style/nsRuleNode.cpp

@@ -6994,10 +6994,11 @@ nsRuleNode::ComputeContentData(void* aStartStruct,
               type = eStyleContentType_NoCloseQuote;  break;
             default:
               NS_ERROR("bad content value");
+              type = eStyleContentType_Uninitialized; break;
             }
-            break;
           default:
             NS_ERROR("bad content type");
+            type = eStyleContentType_Uninitialized;
           }
           data.mType = type;
           if (type == eStyleContentType_Image) {

layout/style/nsStyleStruct.h

@@ -1887,7 +1887,8 @@ enum nsStyleContentType {
   eStyleContentType_CloseQuote    = 41,
   eStyleContentType_NoOpenQuote   = 42,
   eStyleContentType_NoCloseQuote  = 43,
-  eStyleContentType_AltContent    = 50
+  eStyleContentType_AltContent    = 50,
+  eStyleContentType_Uninitialized
 };
 
 struct nsStyleContentData {
@@ -1902,7 +1903,7 @@ struct nsStyleContentData {
 #endif
 
   nsStyleContentData()
-    : mType(nsStyleContentType(0))
+    : mType(eStyleContentType_Uninitialized)
 #ifdef DEBUG
     , mImageTracked(false)
 #endif