libutils: remove whitespaces in String16.cpp and String16.h

Remove trailing whitespaces in both these files.

BUG: None
Change-Id: I18eca5162871b5b2bf7757a7ef36a4e80073798c
diff --git a/libutils/String16.cpp b/libutils/String16.cpp
index 6a5273f..449fb20 100644
--- a/libutils/String16.cpp
+++ b/libutils/String16.cpp
@@ -77,7 +77,7 @@
         //printf("Created UTF-16 string from UTF-8 \"%s\":", in);
         //printHexData(1, str, buf->size(), 16, 1);
         //printf("\n");
-        
+
         return u16str;
     }
 
@@ -127,7 +127,7 @@
         mString = str;
         return;
     }
-    
+
     mString = getEmptyString();
 }
 
@@ -142,7 +142,7 @@
         mString = str;
         return;
     }
-    
+
     mString = getEmptyString();
 }
 
@@ -228,7 +228,7 @@
     } else if (otherLen == 0) {
         return NO_ERROR;
     }
-    
+
     SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
         ->editResize((myLen+otherLen+1)*sizeof(char16_t));
     if (buf) {
@@ -249,7 +249,7 @@
     } else if (otherLen == 0) {
         return NO_ERROR;
     }
-    
+
     SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
         ->editResize((myLen+otherLen+1)*sizeof(char16_t));
     if (buf) {