Code problems detected by cppcheck

Source/platform/graphics/Canvas2DLayerBridge.cpp

Index: Source/platform/graphics/Canvas2DLayerBridge.cpp
diff --git a/Source/platform/graphics/Canvas2DLayerBridge.cpp b/Source/platform/graphics/Canvas2DLayerBridge.cpp
index 492dc2b439a70f7a66dd6b2d0108bf753482c6ba..514c32b49d72f35f408c5bdf2d7aa9ffd3950827 100644
--- a/Source/platform/graphics/Canvas2DLayerBridge.cpp
+++ b/Source/platform/graphics/Canvas2DLayerBridge.cpp
@@ -101,7 +101,7 @@ Canvas2DLayerBridge::~Canvas2DLayerBridge()
     ASSERT(m_destructionInProgress);
     m_layer.clear();
     Vector<MailboxInfo>::iterator mailboxInfo;
-    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); mailboxInfo++) {
+    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); ++mailboxInfo) {
         ASSERT(mailboxInfo->m_status != MailboxInUse);
         if (mailboxInfo->m_status == MailboxReleased) {
             if (mailboxInfo->m_mailbox.syncPoint) {
@@ -278,7 +278,7 @@ bool Canvas2DLayerBridge::prepareMailbox(blink::WebExternalTextureMailbox* outMa
     m_context->makeContextCurrent();
     flush();
     Vector<MailboxInfo>::iterator mailboxInfo;
-    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); mailboxInfo++) {
+    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); ++mailboxInfo) {
         if (mailboxInfo->m_status == MailboxReleased) {
             if (mailboxInfo->m_mailbox.syncPoint) {
                 context()->waitSyncPoint(mailboxInfo->m_mailbox.syncPoint);
@@ -356,7 +356,7 @@ Canvas2DLayerBridge::MailboxInfo* Canvas2DLayerBridge::createMailboxInfo() {
 void Canvas2DLayerBridge::mailboxReleased(const blink::WebExternalTextureMailbox& mailbox)
 {
     Vector<MailboxInfo>::iterator mailboxInfo;
-    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); mailboxInfo++) {
+    for (mailboxInfo = m_mailboxes.begin(); mailboxInfo < m_mailboxes.end(); ++mailboxInfo) {
         if (!memcmp(mailboxInfo->m_mailbox.name, mailbox.name, sizeof(mailbox.name))) {
             mailboxInfo->m_mailbox.syncPoint = mailbox.syncPoint;
             ASSERT(mailboxInfo->m_status == MailboxInUse);