Replace ASSERT with DCHECK in modules/

third_party/WebKit/Source/modules/speech/SpeechSynthesis.cpp

Index: third_party/WebKit/Source/modules/speech/SpeechSynthesis.cpp
diff --git a/third_party/WebKit/Source/modules/speech/SpeechSynthesis.cpp b/third_party/WebKit/Source/modules/speech/SpeechSynthesis.cpp
index b587a1eda3c760f8b3578180f9c0d79586d27a90..2541781cfe4af95cac4d675cb9352d95babe21e3 100644
--- a/third_party/WebKit/Source/modules/speech/SpeechSynthesis.cpp
+++ b/third_party/WebKit/Source/modules/speech/SpeechSynthesis.cpp
@@ -86,7 +86,7 @@ bool SpeechSynthesis::paused() const {
 
 void SpeechSynthesis::StartSpeakingImmediately() {
   SpeechSynthesisUtterance* utterance = CurrentSpeechUtterance();
-  ASSERT(utterance);
+  DCHECK(utterance);
 
   utterance->SetStartTime(MonotonicallyIncreasingTime());
   is_paused_ = false;
@@ -94,7 +94,7 @@ void SpeechSynthesis::StartSpeakingImmediately() {
 }
 
 void SpeechSynthesis::speak(SpeechSynthesisUtterance* utterance) {
-  ASSERT(utterance);
+  DCHECK(utterance);
 
   utterance_queue_.push_back(utterance);
 
@@ -138,7 +138,7 @@ void SpeechSynthesis::FireEvent(const AtomicString& type,
 void SpeechSynthesis::HandleSpeakingCompleted(
     SpeechSynthesisUtterance* utterance,
     bool error_occurred) {
-  ASSERT(utterance);
+  DCHECK(utterance);
 
   bool should_start_speaking = false;
   // If the utterance that completed was the one we're currently speaking,