Fix composition key-code after switching to a new input field.

content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java

Index: content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
index bc92bd0cb0716549647c03cc525fbf757c653e38..d2a20ba3174b3b8ebb3cbaf05ac19b36d63c33dc 100644
--- a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
+++ b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
@@ -180,6 +180,7 @@ public class ImeAdapter {
      */
     void setInputConnection(AdapterInputConnection inputConnection) {
         mInputConnection = inputConnection;
+        mLastComposeText = null;
     }
 
     /**
@@ -259,6 +260,7 @@ public class ImeAdapter {
         }
         mNativeImeAdapterAndroid = nativeImeAdapter;
         mTextInputType = textInputType;
+        mLastComposeText = null;
         if (nativeImeAdapter != 0) {
             nativeAttachImeAdapter(mNativeImeAdapterAndroid);
         }
@@ -435,6 +437,7 @@ public class ImeAdapter {
     }
 
     void finishComposingText() {
+        mLastComposeText = null;
         if (mNativeImeAdapterAndroid == 0) return;
         nativeFinishComposingText(mNativeImeAdapterAndroid);
     }