Misc. warning fixes/cleanup

BUG=81439
TEST=none

Review URL: https://codereview.chromium.org/777853003

Cr-Commit-Position: refs/heads/master@{#308182}

base/profiler/tracked_time.cc

@@ -46,7 +46,7 @@ int32 Duration::InMilliseconds() const { return ms_; }
 TrackedTime::TrackedTime() : ms_(0) {}
 TrackedTime::TrackedTime(int32 ms) : ms_(ms) {}
 TrackedTime::TrackedTime(const base::TimeTicks& time)
-    : ms_((time - base::TimeTicks()).InMilliseconds()) {
+    : ms_(static_cast<int32>((time - base::TimeTicks()).InMilliseconds())) {
 }
 
 // static

chrome/common/worker_thread_ticker.h

@@ -60,10 +60,6 @@ class WorkerThreadTicker {
     tick_interval_ = base::TimeDelta::FromMilliseconds(tick_interval);
   }
 
-  int tick_interval() const {
-    return tick_interval_.InMilliseconds();
-  }
-
  private:
   void ScheduleTimerTask();
 

components/nacl/loader/nacl_ipc_adapter.cc

@@ -824,7 +824,7 @@ void NaClIPCAdapter::SaveMessage(const IPC::Message& msg,
   header.routing = msg.routing_id();
   header.type = msg.type();
   header.flags = msg.flags();
-  header.num_fds = static_cast<int>(rewritten_msg->desc_count());
+  header.num_fds = static_cast<uint16>(rewritten_msg->desc_count());
 
   rewritten_msg->SetData(header, msg.payload(), msg.payload_size());
   locked_data_.to_be_received_.push(rewritten_msg);

sql/test/test_helpers.cc

@@ -92,7 +92,8 @@ bool CorruptSizeInHeader(const base::FilePath& db_path) {
   const unsigned page_size = ReadBigEndian(header + kPageSizeOffset, 2);
 
   // One larger than the expected size.
-  const unsigned page_count = (db_size + page_size) / page_size;
+  const unsigned page_count =
+      static_cast<unsigned>((db_size + page_size) / page_size);
   WriteBigEndian(page_count, header + kPageCountOffset, 4);
 
   // Update change count so outstanding readers know the info changed.
@@ -212,7 +213,7 @@ bool CountTableRows(sql::Connection* db, const char* table, size_t* count) {
   if (!s.Step())
     return false;
 
-  *count = s.ColumnInt64(0);
+  *count = static_cast<size_t>(s.ColumnInt64(0));
   return true;
 }