media: use size_t for integer iterator to Vector::size()

Change-Id: I0a744dc7815a86a993df9b0623440be620ec8903
diff --git a/media/libstagefright/CameraSourceTimeLapse.cpp b/media/libstagefright/CameraSourceTimeLapse.cpp
index daf788b..591daac 100644
--- a/media/libstagefright/CameraSourceTimeLapse.cpp
+++ b/media/libstagefright/CameraSourceTimeLapse.cpp
@@ -134,7 +134,7 @@
     }
 
     bool videoSizeSupported = false;
-    for (uint32_t i = 0; i < supportedSizes.size(); ++i) {
+    for (size_t i = 0; i < supportedSizes.size(); ++i) {
         int32_t pictureWidth = supportedSizes[i].width;
         int32_t pictureHeight = supportedSizes[i].height;
 
diff --git a/media/mtp/MtpDevice.cpp b/media/mtp/MtpDevice.cpp
index 1df7af9..d6d5dd5 100644
--- a/media/mtp/MtpDevice.cpp
+++ b/media/mtp/MtpDevice.cpp
@@ -195,7 +195,7 @@
 
 MtpDevice::~MtpDevice() {
     close();
-    for (unsigned int i = 0; i < mDeviceProperties.size(); i++)
+    for (size_t i = 0; i < mDeviceProperties.size(); i++)
         delete mDeviceProperties[i];
     usb_request_free(mRequestIn1);
     usb_request_free(mRequestIn2);
@@ -253,7 +253,7 @@
             ALOGI("*** FORMAT: %s\n", MtpDebug::getFormatCodeName(format));
             MtpObjectPropertyList* props = getObjectPropsSupported(format);
             if (props) {
-                for (unsigned int j = 0; j < props->size(); j++) {
+                for (size_t j = 0; j < props->size(); j++) {
                     MtpObjectProperty prop = (*props)[j];
                     MtpProperty* property = getObjectPropDesc(prop, format);
                     if (property) {
diff --git a/media/mtp/MtpServer.cpp b/media/mtp/MtpServer.cpp
index 0b1f527..155f645 100644
--- a/media/mtp/MtpServer.cpp
+++ b/media/mtp/MtpServer.cpp
@@ -125,7 +125,7 @@
 void MtpServer::removeStorage(MtpStorage* storage) {
     Mutex::Autolock autoLock(mMutex);
 
-    for (unsigned int i = 0; i < mStorages.size(); i++) {
+    for (size_t i = 0; i < mStorages.size(); i++) {
         if (mStorages[i] == storage) {
             mStorages.removeAt(i);
             sendStoreRemoved(storage->getStorageID());
@@ -137,7 +137,7 @@
 MtpStorage* MtpServer::getStorage(MtpStorageID id) {
     if (id == 0)
         return mStorages[0];
-    for (unsigned int i = 0; i < mStorages.size(); i++) {
+    for (size_t i = 0; i < mStorages.size(); i++) {
         MtpStorage* storage = mStorages[i];
         if (storage->getStorageID() == id)
             return storage;