Keep two empty lines between declarations for cpp files

src/mips/constants-mips.cc

Index: src/mips/constants-mips.cc
===================================================================
--- src/mips/constants-mips.cc	(revision 15486)
+++ src/mips/constants-mips.cc	(working copy)
@@ -58,6 +58,7 @@
   "pc"
 };
 
+
 // List of alias names which can be used when referring to MIPS registers.
 const Registers::RegisterAlias Registers::aliases_[] = {
   {0, "zero"},
@@ -67,6 +68,7 @@
   {kInvalidRegister, NULL}
 };
 
+
 const char* Registers::Name(int reg) {
   const char* result;
   if ((0 <= reg) && (reg < kNumSimuRegisters)) {
@@ -106,11 +108,13 @@
   "f22", "f23", "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31"
 };
 
+
 // List of alias names which can be used when referring to MIPS registers.
 const FPURegisters::RegisterAlias FPURegisters::aliases_[] = {
   {kInvalidRegister, NULL}
 };
 
+
 const char* FPURegisters::Name(int creg) {
   const char* result;
   if ((0 <= creg) && (creg < kNumFPURegisters)) {