--- a/layout/base/nsIPresShell.h
+++ b/layout/base/nsIPresShell.h
@@ -128,20 +128,16 @@ class LayerManager;
 #define CAPTURE_PREVENTDRAG 4
 
 typedef struct CapturingContentInfo {
   // capture should only be allowed during a mousedown event
   PRPackedBool mAllowed;
   PRPackedBool mRetargetToElement;
   PRPackedBool mPreventDrag;
   nsIContent* mContent;
-
-  CapturingContentInfo() :
-    mAllowed(PR_FALSE), mRetargetToElement(PR_FALSE), mPreventDrag(PR_FALSE),
-    mContent(nsnull) { }
 } CapturingContentInfo;
 
 #define NS_IPRESSHELL_IID     \
  { 0xd1978bee, 0x43b9, 0x40de, \
     { 0x95, 0x47, 0x85, 0x06, 0x5e, 0x02, 0xec, 0xb4 } }
 
 // Constants for ScrollContentIntoView() function
 #define NS_PRESSHELL_SCROLL_TOP      0

--- a/layout/base/nsPresShell.cpp
+++ b/layout/base/nsPresShell.cpp
@@ -232,17 +232,19 @@ static NS_DEFINE_IID(kRangeCID,     NS_R
 /* for NS_MEMORY_REPORTER_IMPLEMENT */
 #include "nsIMemoryReporter.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::layers;
 
 PRBool nsIPresShell::gIsAccessibilityActive = PR_FALSE;
-CapturingContentInfo nsIPresShell::gCaptureInfo;
+CapturingContentInfo nsIPresShell::gCaptureInfo =
+  { PR_FALSE /* mAllowed */,     PR_FALSE /* mRetargetToElement */,
+    PR_FALSE /* mPreventDrag */, nsnull /* mContent */ };
 nsIContent* nsIPresShell::gKeyDownTarget;
 
 static PRUint32
 ChangeFlag(PRUint32 aFlags, PRBool aOnOff, PRUint32 aFlag)
 {
   PRUint32 flags;
   if (aOnOff) {
     flags = (aFlags | aFlag);